Humanity’s unquenchable thirst for fresh water is driving up sea levels even faster than melting glaciers, according to new research. The massive impact of the global population’s growing need for water on rising sea levels is revealed in a comprehensive assessment of all the ways in which people use water.
Trillions of tonnes of water have been pumped up from deep underground reservoirs in every part of the world and then channelled into fields and pipes to keep communities fed and watered. The water then flows into the oceans, but far more quickly than the ancient aquifers are replenished by rains. The global tide would be rising even more quickly but for the fact that manmade reservoirs have, until now, held back the flow by storing huge amounts of water on land.
“The water being taken from deep wells is geologically old – there is no replenishment and so it is a one way transfer into the ocean,” said sea level expert Prof Robert Nicholls, at the University of Southampton. “In the long run, I would still be more concerned about the impact of climate change, but this work shows that even if we stabilise the climate, we might still get sea level rise due to how we use water.” He said the sea level would rise 10 metres or more if all the world’s groundwater was pumped out, though he said removing every drop was unlikely because some aquifers contain salt water. The sea level is predicted to rise by 30-100cm by 2100, putting many coasts at risk, by increasing the number of storm surges that swamp cities.
The new research was led by Yadu Pokhrel, at the University of Tokyo, and published in Nature Geoscience. “Our study is based on a state-of-the-art model which we have extensively validated in our previous works,” he said. “It suggests groundwater is a major contributor to the observed sea level rise.” The team’s results also neatly fill a gap scientists had identified between the rise in sea level observed by tide gauges and the contribution calculated to come from melting ice.
The drawing of water from deep wells has caused the sea to rise by an average of a millimetre every year since 1961, the researchers concluded. The storing of freshwater in reservoirs has offset about 40% of that, but the scientists warn that this effect is diminishing.
“Reservoir water storage has levelled off in recent years,” they write. “By contrast, the contribution of groundwater depletion has been increasing and may continue to do so in the future, which will heighten the concerns regarding the potential sea level rise in the 21st century.” Nicholls, who was not part of the research team, said there are a wide range of projections of future sea level. “But this work makes one worry about the uncertainty at the high end more,” he said.
The researchers compared the contribution of groundwater withdrawal and reservoir storage to the more familiar causes of rising sea level: ice melted by global warming and the expansion of the ocean as it warms. The pumping out of groundwater is five times bigger in scale than the melting of the planet’s two great ice caps, in Greenland and Antarctica, and twice as great as both the melting of all other glaciers and ice or the thermal expansion of seawater.
The scale of groundwater use is as vast as it is unsustainable: over the past half century 18 trillion tonnes of water has been removed from underground aquifers without being replaced. In some parts of the world, the stores of water have now been exhausted. Saudi Arabia, for example, was self-sufficient in wheat, grown in the desert using water from deep, fossil aquifers. Now, many of the aquifers have run dry and most wheat is imported, with all growing expected to end in 2016. In northern India, the level of the water table is dropping by 4cm every year.
If moose disappear from the boreal forest of northern Minnesota, as some biologists predict, they will not exit with a thunderous crash. Climate extinctions come quietly, even when they involve 1,000-pound herbivores.
Experts who have studied the Northwestern moose — Alces alces andersoni — believe they are witnessing one of the most precipitous nonhunting declines of a major species in the modern era, yet few outside Minnesota fully appreciate the loss.
The moose is an iconic species whose existence is woven into the social, economic and cultural fabric of this region. Its elongated head and wide antlers are emblazoned on everything from T-shirts to tire flaps. The 1960s cartoon character Bullwinkle J. Moose and his flying squirrel friend Rocky were residents of the fictionalized town of Frostbite Falls, Minn.
But the animals that inspired Bullwinkle are not what they were. Here, even healthy bulls — whose size, strength and rutting prowess make them the undisputed kings of the North Woods — are dying from what appear to be a combination of exhaustion, exposure, wasting disease triggered by parasites and other maladies.
The biologists are baffled and also helpless.
Mark Lenarz, who retired in March from the Minnesota Department of Natural Resources (DNR), where he led moose research efforts, said it’s not like the TV show “CSI: Crime Scene Investigation.”
“Unlike ‘CSI,’ it’s very hard to identify in the field exactly what an animal is dying from,” he said. “We know something about the symptoms” of distressed moose, he added, “but we don’t necessarily know the exact causes of mortality.”
What Lenarz and other experts do know is that a variety of climate stressors — including higher average annual temperatures, a long string of very mild winters, and increasingly favorable conditions for ticks, parasites and other invasive species — are conspiring to make northern Minnesota a moose graveyard.
Since 2002, Minnesota DNR specialists have put radio collars on 150 healthy adult moose; 119 subsequently died, most of them from unknown causes, according to wildlife officials. Car and train collisions accounted for 12 mortalities, while wolves were culpable in just 11 deaths.
Sudden collapse of herds
Meanwhile, annual surveys taken from helicopter overflights show that the state’s primary moose population, in the state’s northeastern Arrowhead region, has been halved in just six years, dropping from 8,840 animals in 2006 to just 4,230 this year. The decline mirrors a similar collapse a decade ago in the state’s northwest corner, where moose plummeted from an estimated 4,000 animals in the mid-1980s to less than 100 by the mid-2000s.
While some monitoring of moose had occurred in the 1990s, most of the animals were gone before scientists could examine cause-and-effect relationships. In the Arrowhead, however, experts are watching mass mortality, discovering multiple moose carcasses in the same area, including animals that appeared relatively healthy only a few years before.
It’s not just the occasional sickly moose succumbing to common causes of mortality, said Lenarz. “We’re out in the
field collecting dead radio-collared moose, and we were finding other moose that had died along with them.”
Similar mysterious deaths of one or more moose have been documented in Voyageurs National Park, where the National Park Service had launched its own radio-collar study of the animals, and in the Boundary Waters Canoe Area Wilderness, where moose sightings used to be routine for visitors but are increasingly rare.
Last month, three Guarani communities, the local Argentine government of Misiones, and the UK-based NGO World Land Trust forged an agreement to create a nature reserve connecting three protected areas in the fractured, and almost extinct, Atlantic Forest. Dubbed the Emerald Green Corridor, the reserve protects 3,764 hectares (9,301 acres) in Argentina; although relatively small, the land connects three protected other protected areas creating a combined conservation area (41,000 hectares) around the size of Barbados in the greater Yaboti Biosphere Reserve. In Argentina only 1 percent of the historical Atlantic Forest survives.
“The agreement that has been reached is truly ground-breaking,” John Burton the head of World Land Trust (WLT) said in a press release, “and it’s been heralded as such by the government of Misiones. In my view, it is probably the most important land purchase the WLT will ever make, because of the innovations involved and the wealth of biodiversity it protects.”
Once stretching along South America’s Atlantic coast from northern Brazil to Argentina, the Atlantic Forest (also known as the Mata Atlantica) has been fragmented by centuries of logging, agriculture, and urbanization. Around 8 percent of the Atlantic Forest still survives, most of it in Brazil, and most of it fragmented and degraded.
“The rainforest of Misiones is the largest remaining fragment of the Atlantic Rainforest of South America. It is full of unique plants and important animal species—it is vital to preserve the best sample of this ecosystem,” noted Sir Ghillean Prance, an advisor to the project and scientific director of the Eden Project, in a press release.
The establishment of the Emerald Green Corridor, which was purchased from logging company Moconá Forestal, ends 16 years of the Guarani communities fighting for their traditional lands. The land will now be considered Traditional Indigenous Lands, while the indigenous community is currently working on a conservation management plan to protect the forest and its species.
A new financial analysis has found that Chevron’s $18 billion Ecuador environmental liability poses a threat of “irreparable damage” to the oil major’s global operations if the plaintiffs make good on their promise to launch legal actions to enforce the judgment in countries where Chevron has billions of dollars in assets.
The report, by social investment analyst Simon Billenness, notes that the long-running case (Aguinda v. ChevronTexaco) “is reaching its most risky phase” for Chevron after an appeals court in Ecuador upheld the judgment in January and rendered it immediately enforceable. The report notes that Chevron’s defenses have been “severely compromised” because of a separate ruling by a New York federal appellate court that vacated a preliminary injunction purporting to bar worldwide enforcement of the judgment.
The Billenness Report also notes that Chevron has yet to disclose in its public filings that its own comptroller, Rex Mitchell, quietly submitted a sworn affidavit to U.S. federal court that concluded any enforcement of the judgment will cause “irreparable damage” to the company. Chevron has been trying to downplay the risk posed by the judgment in its public filings and press releases, concluded Billenness in the report, titled An Analysis of the Financial and Operational Risks to the Chevron Corporation from Aguinda v. ChevronTexaco.
“In sworn legal statements, Chevron has admitted that the company faces ‘irreparable injury’ to [its] business relationships’ [from any enforcement of the Ecuador case] yet has consistently refused to fully characterize these risks to its shareholders,” he wrote in the report. “Shareholders are rightly questioning whether the board and management are fulfilling their fiduciary duties to properly manage the significant risks to the company’s business and value.”
The report also concluded “the enormous breadth of Chevron’s global business operations makes the company particularly vulnerable to enforcement. There are many jurisdictions around the world in which the plaintiffs could seek court recognition and enforcement of the judgment, including many where Chevron has substantial reserves and that are of strategic importance.”
Key findings of the Billenness report include:
The Ecuador judgment poses serious risks to Chevron’s worldwide operations, with the possibility of asset attachments and loss of social license to operate in new areas and markets;
Chevron’s principal legal defenses against enforcement have either been severely compromised or have failed. These include the reversal of a preliminary injunction barring enforcement and the rejection by Ecuador’s government of a private investment arbitration that tried to halt the litigation;
Chevron’s shareholders are stepping up calls for more transparent disclosure of the Ecuador liability, leading to increased pressure on management; and
Chevron risks violating securities laws for withholding material information from shareholders.
Shareholders have been speaking out against Chevron management on the Ecuador issue for some time.
Last year, New York Comptroller Thomas DiNapoli blasted the company for “doing grave reputational damage” to itself by pursuing more legal proceedings “that only delay the inevitable…it’s time to face reality…[t]he entire case is looming like a hammer over shareholders’ heads.” And in a letter last May, several prominent institutional investors called on Chevron “to fully disclose … the risks to its operations and business from the potential enforcement” of the Ecuador judgment.
Chevron refused to even acknowledge or answer either the investor letter, according to the shareholders.
The plaintiffs have said they plan to enforce the judgment in various countries, but they have not announced any specifics other than to say Venezuela and Panama are being considered. Chevron has billions of dollars of assets in Australia, Kazakhstan, Singapore, Brazil, and Venezuela and operates in dozens of countries around the world, said Karen Hinton, the spokesperson for the Ecuadorians.
Billenness specializes in analyzing how environmental, social, and governance factors pose risks to shareholders. He has worked as an analyst and advisor to Trillium Asset Management and the Office of Investment of the AFL-CIO. He is a member of the U.S. Social Investment Forum and consults with entities that focus on social investing.
Tiny pieces of plastic contaminate almost every sea in the world. Now scientists have found that marine creatures like fish and birds are eating this microscopic waste, which may be harming their health.
The main concern is that microplastics are plastic pieces too small to see with the naked eye. They may be small by design, or be fragments of larger pieces of plastic waste.
Their size means they can be mistaken for food by even the smallest sea creatures, as well as large animals like seabirds and fish.
Scientists are concerned about the damage this could be causing. Plastics could block animals’ digestive systems or lower the amount of food they can eat. Not only that, but microplastics can carry toxic chemicals on their surface. So, scientists are calling for further research into pollution from microscopic waste.
“Things have progressed in terms of understanding where you can find microplastics and how much is out there, but we still haven’t worked out what damage this is doing to animals,” says Matthew Cole from the Plymouth Marine Laboratory and the University of Exeter, who has co-authored a major review of all published microplastic studies.
“We’re still on the tip of the iceberg in terms of understanding how these particles affect the health of marine animals,” he adds.
Mass production of plastic began in the 1940s and has since exploded. In 2009, 230 million tonnes of plastic were produced, equivalent to the weight of a double-decker bus every two seconds. The increase in large plastic waste in the sea quickly concerned people, because of its visibility. Understandably, the spread of microscopic plastic fragments has gone largely unnoticed by the general public.
But the chemicals these fragments carry may be more dangerous than the plastics themselves. Plastic often contains additives to make it last longer. These additives can be harmful to health, changing hormonal patterns in fish and birds. And, because plastics are oil-based, they are particularly good at attracting waterborne pollutants from other sources.
These persistent organic pollutants can lead to hormone disruption, development problems and cancer. If marine animals swallow tiny plastic particles, the chemicals on their surface could be easily taken up.
“Almost like a Trojan horse, microplastics can help transfer potentially dangerous chemicals to animals,” Cole explains.
The scientists also looked at where these microplastics come from. Some are designed to be microscopic. These include the beads used in exfoliating facial washes, as well as those used in air-blasters to remove rust and paint from the hulls of boats. Other microplastics may be fragments of bigger objects, from plastic bags to fishing gear.
Half the world’s population lives within just 50 miles of the coast, so it’s easy to see how plastic waste gets into the marine environment. It finds its way into storm drains and sewage systems, where it slips through the filters in wastewater treatment works into rivers and out to sea. Around 80 percent of plastic debris in the sea comes from inland.
Now, Cole is trying to work out whether the tiniest sea creatures, called zooplankton, can take up microplastics. This is the first stage in trying to understand whether these particles can travel up the food chain. If they can get into zooplankton, then they could be passed on to bigger animals that eat them. This so-called trophic transfer could ultimately affect us too.
“If they’re trophically transferred they could end up in the human food supply,” says Cole. “But, without doing a lot more work we won’t know what the full effects of these compounds are.”
