The concept of the “technosphere” aims to reveal the immense scale of our collective impact. The concept was first introduced by US geologist Peter Haff in 2013, but paleobiologist Jan Zalasiewicz has since popularised the term through his work. The technosphere encompasses the vast global output of materials generated by human activities, as well as the associated energy consumption.
Since the agricultural revolution some 12,000 years ago (when we started building cities and accumulating goods), human enterprise has steadily grown. However, our impact has surged dramatically over the past couple of centuries. This surge has since transformed into exponential growth, particularly since 1950.
The technosphere is indicative of how humans are increasingly emerging as a global force on par with the natural systems that shape the world. The transformation that is needed to reduce our impact is therefore equally large. And yet, despite growing awareness, there has been a lack of concrete action to address humanity’s impact on the planet.
To comprehend the sheer magnitude of the technosphere, it is best visualised. So here are four graphs that capture how our collective addiction to “stuff” is progressively clogging up planet Earth.
1. Weighing the technosphere
In 2020, a group of Israeli academics presented a shocking fact: the combined mass of all materials currently utilised by humanity had surpassed the total mass of all living organisms on Earth.
According to their findings, the collective weight of all life on Earth (the biosphere) – ranging from microbes in the soil, to trees and animals on land – stands at 1.12 trillion tonnes. While the mass of materials actively used by humans, including concrete, plastic and asphalt, weighed in at 1.15 trillion tonnes.
The technosphere weighs more than all life on Earth (trillion tonnes):
The relative weights of the active technosphere and biosphere. The active technosphere includes materials that are currently in use by human activities. The biosphere includes all living things. Elhacham et al. (2020), CC BY-NC-ND
This graph offers a glimpse into the immense size of humanity’s footprint. But it likely only scratches the surface.
When accounting for the associated byproducts of the materials used by humans, including waste, ploughed soil and greenhouse gases, the geologist and palaeontologist, Jan Zalasiewicz, calculated that the technosphere expands to a staggering 30 trillion tonnes. This would include a mass of industrially emitted carbon dioxide equivalent to 150,000 Egyptian Pyramids.
2. Changing the Earth
Remarkably, human activity now dwarfs natural processes in changing the surface of our planet. The total global sediment load (erosion) that is transported naturally each year, primarily carried by rivers flowing into ocean basins, is estimated to be around 30 billion tonnes on average. However, this natural process has been overshadowed by the mass of material moved through human action like construction and mining activities.
Humans change the Earth’s surface more than natural processes (billion tonnes):
Global movement of material: average annual natural sediment transport (blue), the total mass of things transported by humans in 1994 (purple) and in 2015 (orange). Cooper at al. (2018) & ScienceDaily (2004), CC BY-NC-ND
3. Transporting ‘stuff’
Our ability to transport fuel and products worldwide has facilitated the trends shown in the preceding graphs. Humans now transport these materials over increasingly vast distances.
Shipping continues to be the primary mechanism for moving materials around the globe. Since 1990, the amount of materials that are shipped around the world has increased more than threefold – and is continuing to grow.
How shipping has grown since 1980 (million tonnes):
Plastic stands out as one of the main “wonder materials” of the modern world. Due to the sheer speed and scale of the growth in plastic manufacturing and use, plastic is perhaps the metric most representative of the technosphere.
The first forms of plastic emerged in the early 20th century. But its mass production began following the second world war, with an estimated quantity of 2 million tonnes produced in 1950. However, the global production of plastic had increased to approximately 460 million tonnes by 2019.
This surge in plastic manufacturing is a pressing concern. Plastic pollution now causes many negative impacts on both nature and humans. Ocean plastics, for example, can degrade into smaller pieces and be ingested by marine animals.
Plastic manufacturing (million tonnes) has grown exponentially since 1950:
Humanity’s escalating impact on planet Earth poses a significant threat to the health and security of people and societies worldwide. But understanding the size of our impact is only one part of the story.
Equally important is the nature, form and location of the different materials that constitute the technosphere. Only then can we understand humanity’s true impact. For example, even the tiniest materials produced by humans, such as nanoplastics, can have significant and far-reaching consequences.
What is clear, though, is that our relentless pursuit of ever-increasing material output is overwhelming our planet.
Dozens of once-pristine rivers and streams in Alaska’s Brooks Range are turning an alarming shade of orange. The discoloration, according to a new study published in the journal Communications Earth and Environment, is likely caused by the thawing of permafrost, which is exposing previously frozen minerals that are now leaching into the waterways.
The research team, led by ecologist Jon O’Donnell from the U.S. National Park Service, documented 75 locations across a vast area of northern Alaska where the crystal-clear waters now appear heavily stained. Using satellite imagery and field observations, the scientists determined that the onset of this discoloration coincided with a period of warming and increased snowfall in the region over the past decade.
Permafrost, which is ground that remains frozen year-round, acts as a storage vault for various minerals. As rising temperatures cause this frozen layer to thaw, these minerals are exposed to water and oxygen, triggering chemical reactions that release iron and other metals into the groundwater. This metal-rich water then makes its way into rivers and streams.
“Our recent study highlights an unforeseen consequence of climate change on Arctic rivers,” study co-author Brett Poulin, an environmental toxicologist from the University of California, Davis, told Mongabay. “Arctic environments are warming up to four times faster than the globe as a whole, and this is resulting in deterioration of water quality in the most pristine rivers in North America.”
Map of orange stream observations across Arctic Inventory and Monitoring Network (ARCN) parks in northern Alaska. Picture inserts show aerial images of select iron-impacted, orange streams. Map created by Carson Baughman, U.S. Geological Survey. Photos by Kenneth Hill, National Park Service. Public domain.
Impacts of iron mobilization in a stream tributary of the Akillik River located in Kobuk Valley National Park, Alaska. These images were taken two years apart. The clear picture was taken in June 2016 and the orange picture was August 2018. Photos by Jon O’Donnell, National Park Service.
Water samples collected from the affected streams revealed lower pH levels and higher concentrations of sulfates and trace metals compared to nearby unaffected waterways. In some cases, the pH levels dropped to 2.3, similar to the acidity of vinegar. The presence of elevated levels of iron, zinc, nickel and copper is the primary cause of the color change.
The ecological consequences of this phenomenon could be significant. At one site in Kobuk Valley National Park, researchers observed the disappearance of fish species and a decline in aquatic insect diversity shortly after the appearance of orange water. Juvenile Dolly Varden trout (Salvelinus malma) and slimy sculpin (Cottus cognatus) were among the fish species that vanished from the stream.
“Many of these affected streams serve as important spawning grounds and nurseries for salmon and other fish species that are crucial to the ecosystem and local subsistence fisheries,” study co-author Michael Carey, a fisheries biologist with the U.S. Geological Survey, said in a statement. “Changes in water quality could have effects throughout the food web.”
Human communities in the region also rely on these rivers and streams for their drinking water supply and subsistence fishing. As permafrost thaw accelerates and more minerals are released into the waterways, the safety and reliability of these resources could be impacted. Poulin emphasized the need for further research to understand the long-term implications for humans.
A tributary of the Kugororuk River runs orange in 2023. Photo by Josh Koch, U.S. Geological Survey. Public Domain.
“Our larger research effort aims to identify where the minerals are located that are the source of the metals and identify which rivers are most sensitive,” Poulin said. “With those two pieces of information, we will be able to accurately assess risk to the ecosystem and humans.”
Poulin also highlighted the uniqueness of these observations, noting that while gradual changes in water quality due to permafrost thaw have been documented in other parts of the Arctic and in high elevations of the Rockies and European Alps, the abrupt changes in water chemistry seen in the Brooks Range are particularly concerning.
“The rivers impacted by this phenomenon span the length of the Brooks Range” — about 1,100 kilometers, or 680 miles — “and involve some of the most pristine rivers in North America that are in protected lands and far from mining sources,” Poulin said.
As scientists work to better understand the complex interactions between thawing permafrost, mineral release and aquatic ecosystems, the study underscores the far-reaching consequences of climate change in the Arctic.
Banner image satellite imagery by Ken Hill, U.S. National Park Service.
Liz Kimbrough is a staff journalist for Mongabay. She has written about science and environmental issues since 2012 and holds a Ph.D. in Ecology and Evolutionary Biology from Tulane University where she studied the microbiomes of trees.
“Number is as fundamental as the other three cardinal metaphors,
space, time, and matter because it is an interrelated aspect of the
divide-and-conquer metaphor which extends and diversifies the primal unity.” – Roger S. Jones, from Physics As Metaphor
where’s the pleasure
when everything’s measured,
and why isn’t water declared
a national treasure,
because everything’s tallied
by numbers in a ledger
monthly bills with
amounts of water,
oil, natural gas, and electricity
the measurement’s diminishing the felicity
it’s mean (literally)
and pretends to be green
the opposite of grist to the mill,
the commodification machine
the commodification machine
with Midas touch
but what you gonna eat
when you touch your burger
and it’s no longer meat
the selfishness is in the word, “mine”
mine for copper, mine for nickel,
mine for lithium, mine for gold
but alchemy is turning cucumber into pickle
grains of sand
and stars in the sky,
too many to count
but at least the stars
they can’t commodify
where’s the pleasure
when everything’s measured,
why isn’t land declared
a national treasure,
because everything’s tallied
by numbers in a ledger
the destruction and deadly side-effects
of divide-and-conquers
proves that disregarding primal unity
is totally bonkers
raindrops, snowflakes,
blades of grass, wildflowers,
too many to count
even with countless hours
it’s mean (literally)
and pretends to be green
the opposite of grist to the mill,
the commodification machine
Editor’s note: Climate change can not be addressed without stopping the extinction and plastics crisis. Every day, an estimated 137 species of plants, animals and insects go extinct due to deforestation alone. Microplastics have been detected in more than 1,300 animal species, including fish, mammals, birds, and insects. A global plastic treaty will only work if it caps production. Bangladesh is about to implement its existing law regarding plastic usage by strictly banning single-use plastic and, gradually, all possible plastic uses.
Scientific models can never account for all of the interconnected relationships within planetary systems’ boundaries. That is one reason why catastrophe predictions are always being pushed ahead.
There is simply no way the current economic system can persist indefinitely on a finite planet. Unfortunately, COP16’s primary goal is critical to striking a sustainable balance between human civilization and the natural world. That is an impossibility. We must tackle the underlying causes of biodiversity loss, including fossil fuel extraction, mining, industrial agriculture, intensive livestock farming, large-scale infrastructure projects, and monoculture tree plantations, basically civilization.
It is time to end civilization. Everything that claims existence must lose it; this is the eternal law. Power never gives up power willingly; it can only be broken with struggle. Nature is struggling to survive; we should help it.
Wildlife, climate and plastic: how three summits aim to repair a growing rift with nature
By the end of 2024, nearly 200 nations will have met at three conferences to address three problems: biodiversity loss, climate change and plastic pollution.
Colombia will host talks next week to assess global progress in protecting 30% of all land and water by 2030. Hot on its heels is COP29 in Azerbaijan. Here, countries will revisit the pledge they made last year in Dubai to “transition away” from the fossil fuels driving climate breakdown. And in December, South Korea could see the first global agreement to tackle plastic waste.
Don’t let these separate events fool you, though.
“Climate change, biodiversity loss and resource depletion are not isolated problems,” says biologist Liette Vasseur (Brock University), political scientist Anders Hayden (Dalhousie University) and ecologist Mike Jones (Swedish University of Agricultural Sciences).
Earth’s fraying parasol “How hot is it going to get? This is one of the most important and difficult remaining questions about our changing climate,” say two scientists who study climate change, Seth Wynes and H. Damon Matthews at the University of Waterloo and Concordia University respectively.
The answer depends on how sensitive the climate is to greenhouse gases like CO₂ and how much humanity ultimately emits, the pair say. When Wynes and Matthews asked 211 authors of past reports by the Intergovernmental Panel on Climate Change, their average best guess was 2.7°C by 2100.
“We’ve already seen devastating consequences like more flooding, hotter heatwaves and larger wildfires, and we’re only at 1.3°C above pre-industrial levels — less than halfway to 2.7°C,” they say.
There is a third variable that is harder to predict but no less important: the capacity of forests, wetlands and the ocean to continue to offset warming by absorbing the carbon and heat our furnaces and factories have released.
This blue and green carbon pump stalled in 2023, the hottest year on record, amid heatwaves, droughts and fires. The possibility of nature’s carbon storage suddenly collapsing is not priced into the computer models that simulate and project the future climate.
However, the ecosystems that buffer human-made warming are clearly struggling. A new report from the World Wildlife Fund (WWF) showed that the average size of monitored populations of vertebrate wildlife (animals with spinal columns – mammals, birds, fish, reptiles and amphibians) has shrunk by 73% since 1970.
Wildlife could become so scarce that ecosystems like the Amazon rainforest degenerate, according to the report.
“More than 90% of tropical trees and shrubs depend on animals to disperse their seeds, for example,” says biodiversity scientist Alexander Lees (Manchester Metropolitan University).
“These ‘biodiversity services’ are crucial.”
The result could be less biodiverse and, importantly for the climate, less carbon-rich habitats.
Plastic in a polar bear’s gut
Threats to wildlife are numerous. One that is growing fast and still poorly understood is plastic.
Bottles, bags, toothbrushes: a rising tide of plastic detritus is choking and snaring wild animals. These larger items eventually degrade into microplastics, tiny fragments that now suffuse the air, soil and water.
“In short, microplastics are widespread, accumulating in the remotest parts of our planet. There is evidence of their toxic effects at every level of biological organisation, from tiny insects at the bottom of the food chain to apex predators,” says Karen Raubenheimer, a senior lecturer in plastic pollution at the University of Wollongong.
Plastic is generally made from fossil fuels, the main agent of climate change. Activists and experts have seized on a similar demand to address both problems: turn off the taps.
In fact, the diagnosis of Costas Velis, an expert in ocean litter at the University of Leeds, sounds similar to what climate scientists say about unrestricted fossil fuel burning:
“Every year without production caps makes the necessary cut to plastic production in future steeper – and our need to use other measures to address the problem greater.”
A production cap hasn’t made it into the negotiating text for a plastic treaty (yet). And while governments pledged to transition away from coal, oil and gas last year, a new report on the world’s energy use shows fossil fuel use declining more slowly than in earlier forecasts – and much more slowly than would be necessary to halt warming at internationally agreed limits. The effort to protect a third of earth’s surface has barely begun.
Each of these summits is concerned with ameliorating the effects of modern societies on nature. Some experts argue for a more radical interpretation.
“Even if 30% of Earth was protected, how effectively would it halt biodiversity loss?” ask political ecologists Bram Büscher (Wageningen University) and Rosaleen Duffy (University of Sheffield).
“The proliferation of protected areas has happened at the same time as the extinction crisis has intensified. Perhaps, without these efforts, things could have been even worse for nature,” they say.
“But an equally valid argument would be that area-based conservation has blinded many to the causes of Earth’s diminishing biodiversity: an expanding economic system that squeezes ecosystems by turning ever more habitat into urban sprawl or farmland, polluting the air and water with ever more toxins and heating the atmosphere with ever more greenhouse gas.”
Previously, anthropogenic ecological overshoot has been identified as a fundamental cause of the myriad symptoms we see around the globe today from biodiversity loss and ocean acidification to the disturbing rise in novel entities and climate change. In the present paper, we have examined this more deeply, and explore the behavioural drivers of overshoot, providing evidence that overshoot is itself a symptom of a deeper, more subversive modern crisis of human behaviour. We work to name and frame this crisis as ‘the Human Behavioural Crisis’ and propose the crisis be recognised globally as a critical intervention point for tackling ecological overshoot. We demonstrate how current interventions are largely physical, resource intensive, slow-moving and focused on addressing the symptoms of ecological overshoot (such as climate change) rather than the distal cause (maladaptive behaviours). We argue that even in the best-case scenarios, symptom-level interventions are unlikely to avoid catastrophe or achieve more than ephemeral progress. We explore three drivers of the behavioural crisis in depth: economic growth; marketing; and pronatalism. These three drivers directly impact the three ‘levers’ of overshoot: consumption, waste and population. We demonstrate how the maladaptive behaviours of overshoot stemming from these three drivers have been catalysed and perpetuated by the intentional exploitation of previously adaptive human impulses. In the final sections of this paper, we propose an interdisciplinary emergency response to the behavioural crisis by, amongst other things, the shifting of social norms relating to reproduction, consumption and waste. We seek to highlight a critical disconnect that is an ongoing societal gulf in communication between those that know such as scientists working within limits to growth, and those members of the citizenry, largely influenced by social scientists and industry, that must act.
For Will Steffen (1947–2023), one of the kindest advocates for our planet in a time of crisis.
‘The conscious and intelligent manipulation of the organized habits and opinions of the masses is an important element in democratic society. Those who manipulate this unseen mechanism of society constitute an invisible government which is the true ruling power of our country. We are governed, our minds are molded, our tastes formed, our ideas suggested, largely by men we have never heard of’. – Edward Bernays, Propaganda, 1928
‘A species causing the extinction of 150 species per day doesn’t need more energy to do more of what it does’. – Hart Hagan, Environmental journalist
Introduction
Modern humans and millions of other species face an unprecedented number of existential threats due to anthropogenic impacts exceeding our planet’s boundaries. We are in dangerous territory with instability in the known realms of biosphere integrity, land system change and novel entities such as plastics and synthetic toxins, climate change, freshwater change and biogeochemical flows.
Considering the dynamic, closed and interconnected nature of Earth’s systems together, these threats pose an increasingly catastrophic risk to all complex life on Earth. Many scientists privately believe it to be already too late to avoid the tipping points that will trigger devastating and irreversible feedback loops.
It is increasingly acknowledged that all of these threats are symptoms of anthropogenic ecological overshoot. Overshoot is defined as the human consumption of natural resources at rates faster than they can be replenished, and entropic waste production in excess of the Earth’s assimilative and processing capacity.
In this paper, we explore the behavioural drivers of overshoot, providing evidence that overshoot is itself a symptom of a deeper, more subversive modern crisis of human behaviour. We work to name and frame this crisis as ‘the Human Behavioural Crisis’ and propose the crisis be recognised globally as a critical intervention point for tackling ecological overshoot. We demonstrate how current interventions are largely physical, resource intensive, slow-moving and focused on addressing the symptoms of ecological overshoot (such as climate change) rather than the distal cause (maladaptive behaviours). We argue that even in the best-case scenarios, symptom-level interventions are unlikely to avoid catastrophe or achieve more than ephemeral progress.
In the final sections of this paper, we propose an interdisciplinary emergency response to the behavioural crisis by, amongst other things, the shifting of social norms relating to reproduction, consumption and waste. We seek to highlight a critical disconnect that is an ongoing societal gulf in communication between those that know such as scientists working within limits to growth, and those members of the citizenry, largely influenced by social scientists and industry, that must act.
Scientists working in limits to growth must join forces with social scientists not only in academia but critically with the non-academic practitioners of applied social and behavioural science. Not only are such practitioners demonstrated masters in the theory of driving behaviour change but crucially also masters of the practical implementation of that theory in the real world.
Lastly, we will provide a possible frame through which to view our species’ ability to consciously drive large-scale behavioural change as an opportunity unavailable to most other species. An implementation of such a framework limiting widespread maladaptive behavioural manipulation may ensure human appetites remain within planetary boundaries, and be key in unlocking a truly prosperous and sustainable future for H. sapiens on Earth.
This paper is not intended to be an exhaustive roadmap to address the behavioural crisis, instead it should be taken as a call to action for interdisciplinary collaboration to achieve just that.
Scope
In this paper, aside from reproductive behaviours which we mention below, our focus is largely confined to socially constructed attitudes, values and behaviours that encourage unnecessary personal consumption, and which have led the world into a state of overshoot.
This focus is critical because, to date, a mere quarter of humanity – the wealthy quarter – is responsible for 74% of excess energy and material use. This, when taken alone, is sufficient to propel the human enterprise into overshoot.
Meanwhile, the quarter of the global population who live below the USD $3.65 poverty line, and the almost half, 47%, who live below the USD $6.85 poverty line9 aspire to achieve equivalent high-end lifestyles, encouraged, in part, by the constant barrage of advertising. To achieve this would certainly increase greenhouse gas emissions, deplete many essential renewable resources from fish-stocks to arable soils and strain global life-support to breaking point, including the risk of triggering runaway hothouse Earth conditions.
We acknowledge that there are many other relevant behaviours and considerations, including genetic pre-dispositions to consume, the role of temporal, spatial and social discounting, socio-political factors (e.g. status hierarchies) and even addiction to conspicuous consumption.
Repeated rewarding experiences help shape the synaptic circuits of the developing brain, predisposing the individual to seek out similar experiences that reinforce the already preformed circuits and to deny or reject contrary inclinations or information.11
We also acknowledge that part of our focus, on media and marketing manipulation, is just one example of how intentional behavioural manipulation undermines planetary and social health. There certainly are other examples – such as how firms and governments limit more sustainable options either by design or consequence. In essence, power dynamics in society underlie the manipulation of needs, wants and desires. This is crucial for understanding how our human predisposition for potentially maladaptive behaviours has been twisted to become actually maladaptive. While we humans are fully capable of regulating ourselves, power dynamics in societies often overcome this. Better understanding this within different societies, and how it perpetuates our ‘polycrises’, will help us move into a wiser and more sustainable civilisation.
In regards to reproductive behaviours, population growth plays, and will continue to play, a significant role in ecological overshoot. Across the globe, the middle class is the fastest-growing segment of the population, projected to grow another billion to reach 5 billion by 2030. Over the coming decades, the majority of projected population growth will be concentrated in the developing world, where the average standard of living must be raised through increases in per-capita consumption. As a result, however, their ecological footprints are likely to increase towards those of the Global North.
Proponents of ‘green growth’ may argue that there is a way to avoid this, however, ‘the burden of proof rests on decoupling advocates’.
To avoid ecological breakdown ‘incrementalist propositions along the lines of green growth and green consumerism are inadequate. The ideals of sufficiency, material thresholds and economic equality that underpin the current modelling are incompatible with the economic norms of the present, where unemployment and vast inequalities are systematic requirements, waste is often considered economically efficient (due to brand-protection, planned obsolescence, etc.) and the indefinite pursuit of economic growth is necessary for political and economic stability’.
Even the relatively conservative IPCC views population growth as a significant factor in climate change (a single symptom of ecological overshoot). Additionally, a recent paper found that population growth has cancelled out most climate gains from renewables and efficiency from the last three decades. For these reasons and more, we have not gone into detail on certain aspects of population dynamics. Instead, we have rooted this paper in ecological economics where population – at any level – plays an important role.
We call for additional research to develop a full understanding of the many dimensions of the behavioural crisis and how we can best address it.
Previous scientists’ warnings
The initial ‘World Scientists’ Warning to Humanity’ was published in 1992, starkly emphasising the collision between human demands and the regenerative capacity of the biosphere. It was followed by a further report, ‘World Scientists’ Warning to Humanity: A Second Notice’ which confirmed that the intervening 25 years had merely accelerated environmental destruction driven by a global population increasing by more than 40% – some 2 billion humans. The ‘World Scientists’ Warning of a Climate Emergency’ report, so far endorsed by 14,859 scientists from 158 countries, proposed a range of measures for restoring and protecting natural ecosystems, conserving energy, reducing pollutants, reducing food waste, adopting more plant-based diets, stabilising population and reforming the global economy.
Subsequent warnings from the scientific community have added to the evidence of overshoot including insect extinctions, the impact of climate change on microorganisms, the freshwater biodiversity crisis, endangered food webs, invasive alien species, the degradation of large lakes, the illegal/unsustainable wildlife trade, the role of affluence, tree extinctions, an imperilled ocean, and population growth as a specific driver. These papers are gathered on the Alliance of World Scientists website.
Despite so many warnings, there has been a marked lack of action, driving several of us to co-author a ‘World Scientists’ Warnings into Action, Local to Global’ paper, so far endorsed by over 3,000 scientists from more than 110 nations, to set out a framework for concrete action to curb our hyper-consumption of resources. This paper focused on the same six key issues (energy, pollutants, nature, food systems, population and the economy, plus governance and leadership), and on three timelines to 2026, 2030 and 2050. None of the key issues identified by the authors are isolated problems; they are all symptoms of human ecological overshoot.
In the present paper, we contend that an underlying behavioural crisis lies at the root of ‘overshoot’ and probe the implications for humanity if we are to retain a habitable planet and civilisation. While human behaviours were implicit in the various world scientists’ warnings, we believe they need explicit attention and concerted emergency action in order to avoid a ghastly future.
Human behaviour drives overshoot
The main drivers of anthropogenic ecological overshoot are human behaviours and cultures relating to consumption and population dynamics. These two factors are mathematically, though certainly not linearly, related. Like other species, H. sapiens is capable of exponential population growth (positive feedback) but until recently, major expansions of the human enterprise, including increases in consumption and waste, were held in check by negative feedback – e.g. resource shortages, competition and disease – which naturally curbed continued population growth.
H. sapiens took around 250,000 years to reach a global population of 1 billion in 1820, and just over 200 years to go from 1 billion to 8 billion. This was largely made possible by our species’ access to cheap, easy, exosomatic energy, mainly fossil fuels. Fossil fuels enabled us to reduce negative feedback (e.g. food shortages) and thus delay and evade the consequences of surpassing natural limits. In that same 200 year period, fossil energy (FF) use increased 1300-fold, fueling a 100-fold increase in real gross world product, i.e. consumption, and the human enterprise is still expanding exponentially. We are arguably in the late boom phase of a one-off boom-bust cycle that is driving us rapidly beyond the safe harbour of planetary boundaries towards chaotic collapse and worse.
Figure 1. Ecological overshoot in number of Earths required. Data from Global Footprint Network – June 2023.
In this paper, we use the term ‘behavioural crisis’ specifically to mean the consequences of the innate suite of human behaviours that were once adaptive in early hominid evolution, but have now been exploited to serve the global industrial economy. This exploitation has accumulated financial capital – sometimes to absurd levels – for investors and shareholders, and generated manufactured capital (‘human-made mass’) that now exceeds the biomass of all living things on Earth. Significantly manipulated by the marketing industry, which several of us represent, these behaviours have now brought humanity to the point where their sheer scale – through our numbers, appetites and technologies – is driving ecological overshoot and threatening the fabric of complex life on earth.
These behaviours are related to our previously highly adaptive, but now self-defeating, impulses to:
• seek pleasure and avoid pain;
• acquire, amass and defend resources from competitors;
• display dominance, status or sex appeal through size, beauty, physicality, aggression and/or ornamentation;
• procrastinate rather than act whenever action does not have an immediate survival benefit particularly for ourselves, close relatives and our home territories (humans are innate temporal, social and spatial discounters).
Many of our continuing environmental and societal challenges arise from these hijacked impulses. In a global economy that strives to create and meet burgeoning demand, rather than fairly and judiciously apportioning supply, these behaviours are collectively highly maladaptive, even suicidal for humanity.
Drivers of overshoot behaviour
The evolutionary drive to acquire resources is by no means exclusive to the human animal. In H. sapiens however, the behaviours of overshoot are now actively promoted and exacerbated by social, economic and political norms largely through the intentional, almost completely unimpeded exploitation of human psychological predispositions and biases. Here, we explore what we consider to be three critical drivers in the creation and continuation of the human behavioural crisis.
Economic growth
Economists define the ‘economy’ as all those organised activities and behaviours associated with the production, allocation, exchange and consumption of the valuable (scarce) goods and services required to meet the needs and wants of the participating population. But this is a simplistic, limited definition. An ecologist might describe the economy as that set of behaviours and activities by which humans interact with their biophysical environment (the ecosphere) to acquire the material resources required for life, and to dispose of the waste materials that result from both our biological and industrial metabolisms. Economic accounts should therefore record all the energy and material ‘throughput’ from the natural world through the human subsystem and back into nature; they should even account for those produced goods that do not enter formal markets, as these add to gross material consumption. In other words, human economic behaviour helps define the human ecological niche, the role H. sapiensplays in interacting with, and altering the structure, function and species composition of, the ecosystems of which we are a part. From this perspective, economics really should be human ecology. But it is not.
Today’s dominant neoliberal economics conceives of the economy as a self-generating ‘circular-flow of exchange (monetary) value’ that operates separately from, and essentially independent of, the natural environment. We generally measure the scale of economic activity in terms of gross national product, i.e. the abstract monetary value of final goods and services produced in a country in a specified time period. Physical natural resources (i.e. ‘the environment’) are seen as merely one of several interchangeable ‘factors of production;’ should a particular resource become scarce, we need only increase the input of other factors (capital, labour, knowledge) or depend on rising prices to stimulate some engineer to find a substitute.
The same simplistic thinking conceives of humans as self-interested utility maximisers (i.e. ‘consumers’) with unlimited material demands and no attachment to family or community. It was easy for modern techno-industrial society to make the leap from believing that the economy is untethered from nature, people essentially insatiable and human ingenuity unbounded, to accepting the notion of unlimited economic growth fostered by continuous technological progress. This helps explain why real gross world product has ballooned 100-fold, and average per capita income (consumption) has increased by a factor of 14 (twice that in wealthy countries) since the early 1800s.
Interestingly, most people seem unaware that this explosion was made possible not only by improving population health but, more importantly, through technologies that use fossil fuels – coal, oil and natural gas. Fossil energy is still the dominant means – 81% of primary energy in 2022 – by which humans acquire sufficient food and other resources to grow and maintain the human enterprise. Between 1800 and 2021, global FF use increased by a factor of 1,402, from just 97 TWh to 136,018 TWh. The average world citizen today uses 175 times as much FF as his/her counterpart in 1800. Remarkably, we humans have burned half the FFs ever consumed and emitted half our total fossil carbon wastes in just the past 30 years
Marketing
Up until the early twentieth century, marketers focused on functional differentiation.
The effectiveness of their work was largely contingent on its ability to ‘spotlight’ functional reasons to buy specific products when people needed them. In essence, the role of marketing was to connect functionally differentiated products with willing buyers. As markets matured, however, competition intensified, and businesses looked to find better ways to differentiate themselves beyond the purely functional.
Around this time, Sigmund Freud’s nephew, Edward Bernays, began experimenting with his uncle’s psychoanalysis work to develop techniques for widespread behavioural manipulation. Bernays later termed this The Engineering of Consent, describing it as the ‘use of an engineering approach – that is, action based only on thorough knowledge of the situation and on the application of scientific principles and tried practices to the task of getting people to support ideas and programs’. Bernays successfully commercialised his work and is commonly regarded as one of the founders of the public relations industry. This novel approach, along with others developed in advertising agencies around the globe, proved highly influential on the way products were marketed and sold to consumers.
Suddenly, marketing effectiveness was no longer determined by its ability to ‘raise awareness’ or harvest existing demand but by its ability to deepen and diversify the needs and wants that could be met through personal consumption. This paradigm shift meant that business growth was no longer constrained by people’s mere biological requirements, it could instead be unlocked by attaching greater meaning to an effectively infinite number of market offerings.
In this brave new world of unchecked business growth, multinationals were no longer marketing hygienic toothpaste, but a mint-flavoured confidence boost – a maintenance purchase was suddenly something that could make you feel more attractive. Cars were no longer being sold based on their functional superiority (i.e. space, speed, comfort, price), but by what they suggested about you as a person (i.e. status, sexiness, rebelliousness, appetite for adventure).
In an era saturated by brands and marketing, consumption has become less reflective of our physical needs and more reflective of our runaway psychology. For example, we may buy to boost our mood, reinforce our identity or elevate our social status above others.
The targeting of consumers has become increasingly effective through the collection and use of data and analytics. The collection and sale of individuals’ personal data is rampant. Unsurprisingly, tech giants like Google and Facebook are amongst the most active in this space. These companies track and sell not only what consumers view online but also their real-world locations through what is known as RTB (Real-Time Bidding).
In the US, users’ personal online data is tracked and shared 294 billion times each day (for your average American, that’s 747 times per day). In Europe, that figure was found to be 197 billion times (Google alone shares this personal data about its German users 19.6 million times per minute). Combined that’s 178 trillion times per annum. All this leads to incredibly detailed data about individual user behaviours and preferences. In fact, a 2017 report found that by the time a US child reaches 13 years old, Ad Tech companies hold an average of 72 million data points on that child.
The subsequent egregious overconsumption, which in combination with the resulting creation of waste, disproportionately multiplied by population, gives the wealthy a far greater negative environmental impact than the poor. Individuals with incomes in the top 10% are now responsible for 25–43% of environmental impact and 47% of CO2 emissions, while the bottom 10% contribute just 3–5% of environmental impact, and the bottom 50% contribute only 10% of CO2 emissions. A recent report found the top 20 wealthiest individuals on Earth produce 8000 times the carbon emissions of the poorest billion people.
For sustainability, reductions in FF and material consumption between 40% and 90% are necessary. This may seem unattainable without a proportionate loss in living standards; however, affluent countries exist far beyond sufficiency. In fact, ‘the drastic increases in societies’ energy use seen in recent decades have, beyond a certain point, had no benefit for the well-being of their populations – social returns on energy consumption per capita become increasingly marginal’. As such, multiple studies now demonstrate per-capita energy consumption in many affluent countries could be decreased substantially and quality living standards still maintained.
Pronatalism
Reproductive decision-making is assumed to be a largely personal choice, free from the constraints of cultural and institutional norms. As a result, discussion of reproduction as it relates to environmental degradation and ecological overshoot is often met with concern regarding impingement of people’s personal desires, rights and actions. However, human reproductive behaviours, like most other behaviours, are greatly influenced by cultural norms and institutional policies and deserve to be investigated critically.
Pronatalism is a set of social and institutional pressures placed on people to have children, often driven by forces such as patriarchy, religion, nationalism, militarism and capitalism. Pronatalism exerts enormous influence on people and their choices.
• Positive feedback is often expressed through glorification of motherhood and large families, financial incentives and subsidies for childbearing, including through assisted reproductive technologies.
• Negative feedback is expressed through stigmatisation of use of contraceptives, abortion and lifepaths that do not fit dominant cultural narratives, such as single adults, childless and childfree people, LGBTQIA+ people, adoptive families, those who regret parenthood or those who do not have the ‘right’ number of children.
Depending on the degree of patriarchal and institutional control in a given culture, stigma can take the form of physical and emotional abuse, divorce, economic marginalisation and social ostracisation. The degree of policing individual parenting choices strongly determines the degree of conformity by individuals in a culture or community. This explains why women’s stated preferences for number and timing of children vary in accordance with the norms of the community in which they reside.
Anthropological studies of later hunter-gathering societies as well as evidence of very early agricultural groups show that the shift to settlement societies led to a systematic diminution of female status, as women went from being active gatherers of food to being relegated to the home sphere, as males dominated the fields. The subsequent rise in population, cities and tribal conflict over land and power created the need for more laborers and warriors, which raised the value of women as child bearers to the exclusion of other roles, thereby underpinning the beginnings of pronatalism.
Due to the dangers associated with pregnancy and childbirth, as well as the laborious process of child-rearing, certain ‘social devices’ had to be employed to make reproduction appear more desirable, thereby population increase would offset the wastage of war and disease. Social devices including the institutions of law, religion, media, education and medicine were used to promote and reinforce the universal idealisation of pregnancy and motherhood.
Over the last 200 years, improvements in public health, medicine, disease control and sanitation – all of which occurred on the back of fossil-fuelled industrialisation – significantly lowered the risk of dying, especially amongst children, leading to unprecedented growth in the human population. Pronatalism remains deeply embedded within institutional policies and norms that glorify and reward reproduction to serve external demographic goals – capitalism, religion, ethnocentrism and militarism amongst others.
Despite great advances in gender equality and opportunities for women in education and the economy over the last several decades, pronatalism remains a strong pillar in many societies. Most religious traditions have strong pronatalist teachings and scriptural mandates to ‘be fruitful and multiply’, further buttressed through misinformation about contraceptives and abortion, and proscriptions on their use. Economists, political leaders and corporate elites regularly argue that keeping fertility high ensures a steady supply of workers, consumers and taxpayers, while generating a larger pool of potential inventors.
Neoliberal economic interests are also enacted through popular media and culture that perpetuate pronatalist narratives. From product advertising and women’s magazines glorifying motherhood, and celebrity gossip fixation on the ‘biological clock’ and ‘baby bump’, to popular movies and television programmes that use pregnancy to ‘complete’ the character arc of a protagonist. The marketing, media and entertainment industries exert an enormous influence on people’s reproductive decision-making.
Meanwhile, neoliberal feminism – feminism of the privileged colonised by neoliberal ideology – seeks to advance political goals and enhance market value and has only reinforced the mandatory-motherhood narrative by advocating for women to ‘have it all’, a goal unattainable for the majority of women around the world. This new form of feminism has conveniently been exploited by the assisted reproductive technology industry, growing annually by 9%, with projected growth to a global $41 billion industry by 2026 to market medically dubious technologies such as egg freezing to increasingly younger women.
Concerns about overpopulation in this century led authorities and advocates to institute campaigns and policies to reduce fertility rates. The majority of these policies, which employed measures to combat pronatalism by providing women the means to control their own fertility through access to education and family planning, proved extremely effective. Countries as diverse as Thailand, Indonesia and Iran saw their fertility rates drop from over six to under two in a matter of decades. On the other hand, coercive policies such as China’s one-child policy, and forced abortion and sterilisation campaigns in Puerto Rico and India, not only led to egregious violations of human and reproductive rights but they also backfired. They created the disastrous legacy of tainting all family-planning campaigns – including the majority that have focused on liberating women – with the blemish of coercion. These draconian measures not only led to widespread suspicion of any efforts towards population reduction and stabilisation but they also had the opposite effect of strengthening and legitimising the centuries-old form of reproductive control: pronatalism. Currently, half of all pregnancies globally are unintended and 257 million women are unable to manage their own fertility due to oppressive pronatalist norms within their communities.
Given that the number of children that women desire is largely a social construct within a hegemonic framework of pronatalism, we must create a new cultural landscape that illuminates the fertility levels that women anywhere in the world might truly desire outside this construct. Fertility trends in every geography where women have greater reproductive autonomy point towards a tendency for smaller families – a choice that has been described as women’s ‘latent desire’ for no or few children.
Addressing population growth, and the pronatalism that drives it, must become central to norm-shifting efforts in order to elevate reproductive rights while also promoting planetary health.
Tackling the behavioural crisis
Current interventions at the symptom-level often do more to maintain the status quo than to address the drivers of ecological overshoot. Accepted approaches are generally technological interventions requiring immense amounts of raw materials and generating proportional ecological damage. For example, the much-hyped wholesale transition of our energy systems from fossil fuels to renewables would require daunting levels of raw material and fossil fuels in a futile struggle to meet humanity’s ever-growing demands. Even if successful – which is not likely – the energy transition would address only a single symptom of ecological overshoot, likely worsening other symptoms significantly in the process. As noted earlier, it is humanity’s access to cheap, convenient energy that has allowed us to overshoot many planetary boundaries. Would anything else change simply because we substitute one form of energy for another?
Conversely, interventions addressing the behavioural crisis shift the focus from treating symptoms to treating the core cultural causes. Prioritising psycho-behavioural change over technological interventions may also have greater potential to relieve anthropogenic pressures on Earth. It would certainly greatly reduce the fossil fuels and material extraction required to maintain the human enterprise. An example of an intervention at this level could be the intentional creation of new social norms for self-identity to change human behaviours relating to consumption, population and waste.
Paradoxically, the marketing, media and entertainment industries complicit in the creation and exacerbation of the behavioural crisis, may just be our best chance at avoiding ecological catastrophe. Storytelling shapes appetites and norms: in this paper, we focus largely on the marketing industry, but we believe it important to highlight the potential of the media and entertainment industries for addressing the behavioural crisis also. Modelling behaviour through entertainment can be an extremely powerful way of driving behavioural change. A real-world example of this can be seen through the telenovelas created by the Population Media Centre. PMC’s broadcasts have been remarkably successful in changing reproductive behaviours in many countries through the role modelling of small family norms, delaying marriage until adulthood, female education and the use of family planning. In Ethiopia, pre and post-broadcast quantitative surveys found that listeners were 5.4 times more likely than non-listeners to know at least three family planning methods. Married women who were listeners increased current use of modern family planning methods from 14% to 40%, while use amongst non-listeners increased less than half of that.
It is also worth noting that when it comes to addressing maladaptive behaviours in the current paradigm, there appears to be a focus on raising awareness and education under the arguable assumption that this will lead to the desired behavioural changes. While awareness and education certainly have important roles to play in combating ecological overshoot, they are relatively ineffective at driving behavioural change. Can the same behavioural mechanisms that built and fuelled our immense appetites bring them back within planetary limits to growth?
Lessons from the marketing industry
For more than 100 years, marketers, and recently behavioural scientists, have become proficient at influencing human desires, particularly consumer behaviour. The frameworks of persuasion they have developed could help bring humanity, and countless other species, back to safe harbour by reducing per capita consumption through the celebration of lives of sufficiency, and setting healthy reproductive norms, all without triggering feelings of loss or regret in the general populace.
Though good marketing may seem like black magic, and the exclusive domain of a select number of creative ‘gurus’, it is actually an accessible and highly replicable system of proven practices and principles crafted to influence behaviour.
Broadly speaking, marketers strive to influence individuals’ felt wants and purchasing patterns in one of two key ways: by changing an individual’s perceptions of a product or by changing the social context in which specific forms of consumption take place. It follows that the same strategies can be put to use to redirect consumers’ behaviour rather than reinforcing the present consumption-based crisis. An individual’s belief about a product or service’s value relies heavily on how it is ‘framed’.
Tversky and Kahneman have extensively demonstrated this framing effect, showing that people’s choices can be predictably shifted, not through changing the choices themselves, but by changing what consumers perceive as the salient qualities of available choices. For instance, advertising a yoghurt as 98% Fat Free is much more compelling than promoting the same product as containing only 2% milk-fat. Similarly, people who would be turned off by the promotion of a vegan diet may be completely receptive to the same regime when it is advertised as a plant-based or cholesterol-free diet.
Of the many ways to frame a new behavioural choice, the most successful will offer a clear and relevant benefit to switching. It is not, for instance, as effective to sell nicotine patches merely as a means to quit smoking as it is to promote them in terms of concrete personal benefits (e.g. better relationships, improved health, longer life, etc.). In short, if we were to effectively address the crisis of human behaviour, the desirable alternative behaviours (e.g. flying less, driving less, wasting less, having fewer children) must be creatively framed in ways that accentuate the benefits to the individual rather than highlight their personal sacrifices.
Human behaviour – like that of many other animals – is not driven merely by individual perceptions and values but also by the social context and system in which it occurs. In regards to the former, we act in ways that advertise our wealth, sexual prowess or social status. Much like the peacock with its ornate tail or the stotting Springbok, humans have developed species-specific signals to demonstrate particular attributes or qualities to others.
While the intent of these signals remains largely the same across cultures and over time (i.e. to establish status, attractiveness, dominance, trustworthiness, etc.) the physical means of expression is constantly changing (e.g. from precious gold, silk or ivory in preindustrial times to the prestige automobiles and expensive sound equipment in the 1980s, to the high-end computers, iPhones and understated Airpods of the 2000s). By better understanding what values and qualities people are trying to signal about themselves, we can design alternative perceptual framing that results in dramatically altered behaviour. For example, in one highly successful Australian road safety campaign, a team of marketers was able to effectively reframe the meaning of dangerous high-speed driving from signalling ‘masculine bravery’ to signalling ‘masculine insecurity’. Similarly, between 1979 and 2012, strategic efforts were made to reduce the practice of driving while under the influence of alcohol in the UK. Through decades of targeted marketing, community advocacy and police enforcement, the dangerous behaviour was successfully transformed from exceptionally commonplace (i.e. performed by over half the male driving population) to exceptionally rare (i.e. viewed as unacceptable by 92% of the population).
This idea of signalling becomes particularly significant in light of the disproportionately negative impact that wealthy people have on the ecosphere through ‘conspicuous consumption’. While wasteful excess has historically been a reliable cross-cultural signal of social status, there is now promising evidence that this too is amenable to change in response to increasing eco-consciousness. Recent studies have pointed to a counter-signalling effect amongst wealthier populations, wherein more status is actually conferred to those who consciously try to impress by consuming less (e.g. driving modest cars, taking transit, wearing clothes from the thrift store, etc.). By developing ways to positively socialise responsible behaviour, we can help people maintain their sense of self-worth and social status while reducing their contribution to ecological overshoot.
Although social norms may be shifting slightly in the right direction amongst the wealthy, such a values revolution is unlikely to occur in a time frame rapid enough to restore humanity to a survivable limits to growth scenario. In order to effect the rapid changes necessary to secure our long-term survival, we must consider how marketing, behavioural science and other direct instruments of social influence, including but not limited to the media and entertainment industries, might be used in an emergency response to accelerate the process. At the same time, we must find ways to support the billions of individuals who are greatly in need of increases in consumption to do so without inducing further planetary harm.
While the stigmatisation of ‘driving under the influence’ took decades, recent developments in social networks theory have shown that comparable changes are possible within a timescale of years. With a concerted, multidisciplinary effort by the aforementioned industries, radical change would likely be possible even sooner. The concept of the social ‘tipping point’ shows that as a belief or value spreads through a population, there is a catalytic threshold beyond which there is accelerated widespread adoption of that belief. Evidence suggests that this ‘tipping point’ can occur after just 25% of a study population has accepted the belief as a new norm. This finding may be highly relevant to negate our behavioural crisis in an effective time frame.
Conceivably, there may be a ‘tipping point’ in social acceptance of the values associated with degrowth, where they are likely to become positively reinforced through various forms of media and entertainment without conscious participation. We urgently call for an emergency, concerted, multidisciplinary effort to target the populations and value levers most likely to produce the threshold effect, and catalyse rapid global adoption of new consumption, reproduction and waste norms congruent with the survival of complex life on Earth.
Directing and policing widespread behaviour manipulation
Behavioural manipulation has been intentionally used for nefarious purposes before, and as we’ve just explored, has played a critical role in the creation of the behavioural crisis and consequential ecological overshoot. Eco-centric behaviour is the heart of any sustainable future humanity might wish to achieve. Moreover, we are at a crossroads, with three paths ahead:
• We can choose to continue using behavioural manipulation to deepen our dilemma,
• We can choose to ignore it and leave it to chance, or
• We can use an opportunity that almost no other species has had and consciously steer our collective behaviours to conform to the natural laws that bind all life on Earth.
This raises ethical questions, for example, who is worthy of wielding such power? At present, the answer is anyone with the necessary influence or financial means to exploit it. However, we should not entrust this to any individual human, company, government or industry. Instead, any continued use of widespread behavioural manipulation should be firmly bound by, and anchored within a framework built upon the laws of the natural world, as well as the science on limits to growth.
We urgently call for increased interdisciplinary work to be carried out in directing, understanding and policing widespread behaviour manipulation.
Conclusion
In summary, the evidence indicates that anthropogenic ecological overshoot stems from a crisis of maladaptive human behaviours. While the behaviours generating overshoot were once adaptive for H. sapiens, they have been distorted and extended to the point where they now threaten the fabric of complex life on Earth. Simply, we are trapped in a system built to encourage growth and appetites that will end us.
The current emphasis for overshoot intervention is resource intensive (e.g. the global transition to renewable energy) and single-symptom focused. Indeed, most mainstream attention and investment is directed towards mitigating and adapting to climate change. Even if this narrow intervention is successful, it will not resolve the meta-crisis of ecological overshoot, in fact, with many of the current resource-intensive interventions, it is likely to make matters worse. Psychological interventions are likely to prove far less resource-intensive and more effective than physical ones.
• We call for increased attention on the behavioural crisis as a critical intervention point for addressing overshoot and its myriad symptoms.
• We advocate increased interdisciplinary collaboration between the social and behavioural science theorists and practitioners, advised by scientists working on limits to growth and planetary boundaries.
• We call for additional research to develop a full understanding of the many dimensions of the behavioural crisis (including the overwhelming influence of power structures) and how we can best address it.
• We call for an emergency, concerted, multidisciplinary effort to target the populations and value levers most likely to produce rapid global adoption of new consumption, reproduction and waste norms congruent with the survival of complex life on Earth.
• We call for increased interdisciplinary work to be carried out in directing, understanding and policing widespread behaviour manipulation.
The clock is ticking not only because the health of the natural systems upon which we are utterly dependent is deteriorating but also because broadscale interventions are only possible when a society holds together and is capable of coherent action. As the effects of overshoot worsen, the likelihood of societal breakdown increases. We still have an opportunity to be proactive and utilise the intact systems we have in place to deliver a framework for shifting social norms and other necessities for addressing the behavioural crisis. However, the day may come when societal breakdown will make intervention impossible, locking the planet into an unguided recovery that may salvage much of ‘nature’ but be inhospitable to human life.
Editor’s note: This article is an update from a year ago. Trying to fix the climate change planetary boundary at the expense of biodiversity or any of the other planetary boundaries is a fool’s errand. This article does not state the fact that it only takes one planetary boundary to collapse to cause a massive die-off of life on the planet. Plus no mention of the poly-crisis of nuclear war, increasing inequality, AI and global economic crash.
Turning and turning in the widening gyre
The falcon cannot hear the falconer;
Things fall apart; the centre cannot hold;
Mere anarchy is loosed upon the world,
The blood-dimmed tide is loosed, and everywhere
The ceremony of innocence is drowned;
The best lack all conviction, while the worst
Are full of passionate intensity. – The Second Coming William Butler Yeats in 1919
By Edward Carver writer for Common Dreams
Six of nine planetary boundaries have already been transgressed, and a seventh, for ocean acidification, is on the verge of being breached, according to a major report released Monday.
The 96-page report, produced by the Potsdam Institute for Climate Impact Research (PIK), is the first in a planned series of annual “planetary health checks.”
The authors found that safe planetary boundaries had already been crossed for the climate, freshwater, land use, biogeochemical flows, novel entities, and biosphere integrity—in keeping with a study in Science Advances last year. They found a “clear trend towards further transgression”—moving deeper into the danger zone, where irreversible tipping points are more likely to be triggered—in each of the six categories.
“Our updated diagnosis shows that vital organs of the Earth system are weakening, leading to a loss of resilience and rising risks of crossing tipping points,” Levke Caesar, a PIK climate physicist lead author of the report, said in a statement that announced a “red alert.”
The health check also showed that ocean acidification, a seventh category, has reached a dangerous precipice, putting the foundations of the marine food web at risk. Ocean acidification, which can threaten coral reefs and phytoplankton populations, is caused by the buildup of carbon dioxide from burning fossil fuels and other human activities.
Caesar said a “safe operating space” threshold for acidification could be crossed in the next few years.
“Looking at the current evolution, I’d say it’s really, really difficult to prevent that [boundary] crossing,” she toldMongabay.
A graphic shows the status of nine environmental categories, four of which have been broken down into two control variables. Image from Planetary Health Check 2024. Design by Globaïa.
PIK director Johan Rockström, a co-author of the new report, helped develop planetary boundary research in the late 2000s. In a seminal 2009 paper in Nature, he and his co-authors found that three of the nine boundaries had already been crossed. That number has gradually gone up based on a series of studies over the last decade.
The planet boundary framework, which is often connected to the degrowth movement, emphasizes that the categories are interconnected.
“The interconnectedness of [planetary boundary] processes means that addressing one issue, such as limiting global warming to 1.5°C, requires tackling all of them collectively,” the new report says.
Boris Sakschewski, a climate scientist who, along with Caesar, is a lead author of the report said that, “We know that all planetary boundary processes act together and each one needs protection to protect the whole system.”
The consequences of continued ocean acidification, which is primarily measured by aragonite saturation, would be severe, the report warns.
Ocean acidification is approaching a critical threshold, with significant declines in surface aragonite saturation, particularly in high-latitude regions like the Arctic and Southern Ocean. These areas are vital for the marine carbon pump and global nutrient cycles, which support marine productivity, biodiversity, and global fisheries. The growing acidification poses an increasing threat to marine ecosystems, especially those reliant on calcium carbonate for shell formation.
Some researchers believe that the ocean acidification threshold has already been crossed, especially given regional variability, with cooler polar waters absorbing more carbon dioxide, causing a faster drop in pH levels.
The report was written with a general audience in mind and is not peer-reviewed, though it’s based on peer-reviewed studies, the authors said.
The final pages of the report present solutions, especially agricultural. A radical overhaul of the global food system, heavily dependent on fertilizer and other harmful inputs, will be necessary to reverse the disturbing trends documented in the report, the authors wrote.
“Sometimes overlooked compared to the impacts of energy production and consumption—particularly the use of fossil fuels—the food systems we depend on are among the largest drivers of environmental degradation. The global food system is the single largest driver behind the transgression of multiple planetary boundaries,” the report says.
Almost 200 people were killed in 2023 for attempting to protect their lands and communities from ecological devastation, Global Witness revealed Tuesday.
This raises the total number of environmental defenders killed between 2012—when Global Witness began publishing its annual reports—and 2023 to 2,106.
“As the climate crisis accelerates, those who use their voice to courageously defend our planet are met with violence, intimidation, and murder,” Laura Furones, the report’s lead author and senior adviser to the Land and Environmental Defenders Campaign at Global Witness, said in a statement. “Our data shows that the number of killings remains alarmingly high, a situation that is simply unacceptable.”
At least 196 people were murdered in 2023, 79 of them in Colombia, which was both the deadliest country for defenders last year and the deadliest overall. In 2023, more defenders were killed in Colombia than have ever been killed in one country in a given year since Global Witness began its calculations.
While the government of left-wing President Gustavo Petro has promised to protect activists, organizers on the ground say the situation has only gotten worse for defenders in the past year. Colombia will host the 16th Conference of Parties to the Convention on Biological Diversity in October and has promised to highlight the role of defenders in protecting nature. This presents a “historic opportunity” to stand up for the rights of environmental activists, Global Witness said.
Overall, Latin America is the deadliest region for defenders, making up 85% of killings in 2023. It was home to the four deadliest countries for defenders—Colombia, Brazil, Honduras, and Mexico—which together accounted for 70% of all killings. Honduras also saw the highest number of killings per capita, both in 2023 and over the past 11 years.
“It is the job of leaders to listen and make sure that defenders can speak out without risk.”
The fifth deadliest country for defenders in 2023 was the Philippines, which saw 17 people killed. Overall, nearly 500 people have been murdered in Asia since 2012, with the Philippines remaining the deadliest country in the region during that time. Global Witness recorded four deaths in Africa in 2023, and 116 since 2012, but noted that this is likely a “gross underestimate” as killings on the continent are more difficult to document due to a lack of information.
Global Witness cannot always link a particular industry to the murders of the land defenders who oppose environmental harm. In Colombia, for example, it estimates that half of people killed in 2023 were killed by organized criminal elements. However, for the deaths it was able to connect, most people died after opposing mining operations at 25. This was followed by logging (5), fishing (5), agribusiness (4), roads and infrastructure (4), and hydropower (2).
The threat of even more mining-related violence looms as nations scramble for the critical minerals necessary for the transition away from fossil fuels and toward renewable forms of energy. This dovetails with another component of Global Witness’ findings: the disproportionate violence borne by Indigenous communities for defending their homes. Of the defenders killed in 2023, nearly half were Indigenous peoples or Afro-descendants, and almost half of the minerals needed for the energy transition are located on or near Indigenous or peasant land.
Jenifer Lasimbang, an Indigenous Orang Asal woman from Malaysia and executive director of Indigenous Peoples of Asia Solidarity Fund, explained the situation her community faces:
In Malaysia, as in many other countries, we Indigenous Peoples have been subject to wave after wave of destruction. First came the logging and oil palm companies. As a result, nearly 80% of the land surface in Malaysian Borneo has been cleared or severely damaged.
Now, as the world moves away from a fossil-fuel based economy, we’re seeing a rush for critical minerals, essential to succeed in the transition to a green economy.
With Malaysia the regional leader in aluminium, iron and manganese production, extracting rare minerals isn’t new to us. But our experience so far has been that this comes at a huge environmental cost.
The Malaysian government is issuing an increasing number of prospecting and mining licenses. We know what this new “green rush” means for us. We know it’s going to get worse while demand for resources remains high.
Lasimbang said that her community did not oppose development itself, but an “unsustainable and unequal global system” predicated on ever-increasing consumption, and that world leaders should learn from Indigenous communities like hers how to sustain a society without destroying the environment.
“There is only really one thing left to say: Trust us. Let us lead. We will take you with us,” Lasimbang said.
While global awareness of the climate crisis and commitments to address it should have translated into greater protections for those on the frontlines of defending biodiversity, that has not been the case. Since the Paris Agreement was signed in 2015, at least 1,500 defenders have been murdered, Global Witness said.
Even in wealthier countries like the U.K., E.U., and the U.S. where killings are less frequent, governments have increasingly repressed environmental activists by criminalizing protests. In 2023, Global Witness observed that the “global surge in anti-protest legislation persisted.”
For example, in 2023 the U.K. expanded its Public Order Act to allow police to prosecute certain protests that disrupted national infrastructure or caused “more than a minor” disturbance. In November of that year, police arrested at least 630 people for marching slowly on a public road to protest new fossil fuel projects.
In the U.S., more than 20 states have passed “critical infrastructure” laws that target protests against fossil fuel projects like pipelines. E.U. countries have passed similar laws as well.
Even in the developed world, the criminalization of protest can turn deadly: In January 2023, police in Georgia shot and killed 26-year-old defender Manuel Esteban Paez Terán, or Tortuguita, as they were camping out in a local forest to prevent it from being bulldozed to facilitate the construction of a “Cop City” training facility.
To protect defenders worldwide, Global Witness called on governments and businesses to document attacks and hold perpetrators to account.
“Governments cannot stand idly by; they must take decisive action to protect defenders and to address the underlying drivers of violence against them,” Furones said. “Activists and their communities are essential in efforts to prevent and remedy harms caused by climate-damaging industries. We cannot afford to, nor should we tolerate, losing any more lives.”
Nonhle Mbuthuma of South Africa, who won the Goldman Environmental Prize in 2024, wrote in the report’s forward that both defenders and governments had a role to play in creating a more just and sustainable world as it teeters on the brink of climate and ecological breakdown.
“Now it is my role, as a defender, to push elite power to take radical action that swings us away from fossil fuels and toward systems that benefit the whole of society,” Mbuthuma wrote. “It is the job of leaders to listen and make sure that defenders can speak out without risk. This is the responsibility of all wealthy and resource-rich countries across the planet.”
The relative weights of the active technosphere and biosphere. The active technosphere includes materials that are currently in use by human activities. The biosphere includes all living things.
Global movement of material: average annual natural sediment transport (blue), the total mass of things transported by humans in 1994 (purple) and in 2015 (orange).
Shipping capacity growth between 1980 and 2022.
Annual plastic production.
Map of orange stream observations across Arctic Inventory and Monitoring Network (ARCN) parks in northern Alaska. Picture inserts show aerial images of select iron-impacted, orange streams. Map created by Carson Baughman, U.S. Geological Survey. Photos by Kenneth Hill, National Park Service. Public domain.
Impacts of iron mobilization in a stream tributary of the Akillik River located in Kobuk Valley National Park, Alaska. These images were taken two years apart. The clear picture was taken in June 2016 and the orange picture was August 2018. Photos by Jon O’Donnell, National Park Service.
