by Deep Green Resistance News Service | Sep 17, 2012 | Climate Change
By John Vidal / The Guardian
One of the world’s leading ice experts has predicted the final collapse of Arctic sea ice in summer months within four years.
In what he calls a “global disaster” now unfolding in northern latitudes as the sea area that freezes and melts each year shrinks to its lowest extent ever recorded, Prof Peter Wadhams of Cambridge University calls for “urgent” consideration of new ideas to reduce global temperatures.
In an email to the Guardian he says: “Climate change is no longer something we can aim to do something about in a few decades’ time, and that we must not only urgently reduce CO2 emissions but must urgently examine other ways of slowing global warming, such as the various geoengineering ideas that have been put forward.”
These include reflecting the sun’s rays back into space, making clouds whiter and seeding the ocean with minerals to absorb more CO2.
Wadhams has spent many years collecting ice thickness data from submarines passing below the arctic ocean. He predicted the imminent break-up of sea ice in summer months in 2007, when the previous lowest extent of 4.17 million square kilometres was set. This year, it has unexpectedly plunged a further 500,000 sq km to less than 3.5m sq km. “I have been predicting [the collapse of sea ice in summer months] for many years. The main cause is simply global warming: as the climate has warmed there has been less ice growth during the winter and more ice melt during the summer.
“At first this didn’t [get] noticed; the summer ice limits slowly shrank back, at a rate which suggested that the ice would last another 50 years or so. But in the end the summer melt overtook the winter growth such that the entire ice sheet melts or breaks up during the summer months.
“This collapse, I predicted would occur in 2015-16 at which time the summer Arctic (August to September) would become ice-free. The final collapse towards that state is now happening and will probably be complete by those dates”.
Wadhams says the implications are “terrible”. “The positives are increased possibility of Arctic transport, increased access to Arctic offshore oil and gas resources. The main negative is an acceleration of global warming.”
“As the sea ice retreats in summer the ocean warms up (to 7C in 2011) and this warms the seabed too. The continental shelves of the Arctic are composed of offshore permafrost, frozen sediment left over from the last ice age. As the water warms the permafrost melts and releases huge quantities of trapped methane, a very powerful greenhouse gas so this will give a big boost to global warming.”
From The Guardian: http://www.guardian.co.uk/environment/2012/sep/17/arctic-collapse-sea-ice
by Deep Green Resistance News Service | Sep 10, 2012 | ANALYSIS, Biodiversity & Habitat Destruction, Climate Change
By Mongabay
Already facing an onslaught of threats from logging and conversion for agriculture, forests worldwide are increasingly impacted by the effects of climate change, including drought, heightened fire risk, and disease, putting the ecological services they afford in jeopardy, warns a new paper published in the journal Nature Climate Change.
The study, authored by William Anderegg of Carnegie Institution for Science at Stanford University and Jeffrey Kane and Leander Anderegg of Northern Arizona University, reviews dozens of scientific papers dealing with the ecological impacts of climate change. They find widespread cases of forest die-off from drought and elevated temperatures, which can increase the incidence of fire and pest infestations like pine beetles. These effects have the potential to trigger transitions to other ecosystems, including scrubland and savanna. But the impacts vary from forest to forest and the authors say more research is needed to fully understand the effects of climate change on forest ecosystems.
However it is not only forests that are affected by climate change — they themselves impact climate. Forests store 45 percent of the carbon found in terrestrial ecosystems and sequester as much as 25 percent of annual carbon emissions from human activities, helping mitigate a key driver of climate change. Yet they also raise local temperate by absorbing sunlight. Clearing forests in polar regions has the paradoxical effect of increasing the reflectivity of Earth’s surface, reducing local temperatures. Yet clear-cutting of forests in the tropics accounts for 8-15 percent of anthropogenic greenhouse gas emissions.
The authors say that the research gaps make it difficult to forecast the economic and ecological impacts of climate change on forests, which cover cover some 42 million square kilometers or 30 percent of Earth’s land surface and underpin hundreds of billions to trillions of dollars a year in economic activity.
“The varied nature of the consequences of forest mortality means that we need a multidisciplinary approach going forward, including ecologists, biogeochemists, hydrologists, economists, social scientists, and climate scientists,” said William Anderegg in a statement. “A better understanding of forest die-off in response to climate change can inform forest management, business decisions, and policy.”
From Mongabay: “Climate change causing forest die-off globally”
Photo by Federico Bottos on Unsplash
by Deep Green Resistance News Service | Aug 30, 2012 | Climate Change
By Press Association
A vast reservoir of the potent greenhouse gas methane may be locked beneath the Antarctic ice sheet, a study suggests.
Scientists say the gas could be released into the atmosphere if enough of the ice melts away, adding to global warming.
Research indicates that ancient deposits of organic matter may have been converted to methane by microbes living in low-oxygen conditions.
The organic material dates back to a period 35m years ago when the Antarctic was much warmer than it is today and teeming with life.
Study co-author Prof Slawek Tulaczyk, from the University of California at Santa Barbara, said: “Some of the organic material produced by this life became trapped in sediments, which then were cut off from the rest of the world when the ice sheet grew. Our modelling shows that over millions of years, microbes may have turned this old organic carbon into methane.”
Half the West Antarctic ice sheet and a quarter of the East Antarctic sheet lie on pre-glacial sedimentary basins containing around 21,000bn tonnes of carbon, said the scientists, writing in the journal Nature.
British co-author Prof Jemma Wadham, from the University of Bristol, said: “This is an immense amount of organic carbon, more than 10 times the size of carbon stocks in northern permafrost regions.
“Our laboratory experiments tell us that these sub-ice environments are also biologically active, meaning that this organic carbon is probably being metabolised into carbon dioxide and methane gas by microbes.”
The amount of frozen and free methane gas beneath the ice sheets could amount to 4bn tonnes, the researchers estimate.
Disappearing ice could free enough of the gas to have an impact on future global climate change, they believe.
“Our study highlights the need for continued scientific exploration of remote sub-ice environments in Antarctica because they may have far greater impact on Earth’s climate system than we have appreciated in the past,” said Prof Tulaczyk.
The Antarctic ice sheet covers the southern continent’s land mass and not the sea around it. Methane hydrates – a combination of frozen water ice and methane – are also found at the bottom of the oceans where they form as a result of cold temperatures and high pressures.
From The Guardian: http://www.guardian.co.uk/environment/2012/aug/29/antarctica-methane
by Deep Green Resistance News Service | Aug 23, 2012 | Climate Change
By John Vidal / The Guardian
Arctic sea ice is set to reach its lowest ever recorded extent as early as this weekend, in “dramatic changes” signalling that man-made global warming is having a major impact on the polar region.
With the melt happening at an unprecedented rate of more than 100,000 sq km a day, and at least a week of further melt expected before it begins to reform ahead of the northern winter, satellites are expected to confirm the record – currently set in 2007 – within days.
“Unless something really unusual happens we will see the record broken in the next few days. It might happen this weekend, almost certainly next week,” Julienne Stroeve, a scientist at the US National Snow and Ice Data Centre in Boulder, Colorado, told the Guardian.
“In the last few days it has been losing 100,000 sq km a day, a record in itself for August. A storm has spread the ice pack out, opening up water, bringing up warmer water. Things are definitely changing quickly.”
Because ice thickness, volume, extent and area are all measured differently, it may be a week before there is unanimous agreement among the world’s cryologists (ice experts) that 2012 is a record year. Four out of the nine daily sea ice extent and area graphs kept by scientists in the US, Europe and Asia suggest that records have already been broken.
“The whole energy balance of the arctic is changing. There’s more heat up there. There’s been a change of climate and we are losing more seasonal ice. The rate of ice loss is faster than the models can capture [but] we can expect the arctic to be ice-free in summer by 2050,” said Stroeve.
“Only 15 years ago I didn’t expect to see such dramatic changes, no one did. The ice-free season is far longer now. Twenty years ago it was about a month. Now it’s three months. Temperatures last week in the arctic were 14C, which is pretty warm.”
Read more from The Guardian: http://www.guardian.co.uk/environment/2012/aug/23/arctic-sea-ice-record-low
by Deep Green Resistance News Service | Aug 15, 2012 | Climate Change, Obstruction & Occupation
By Will Wooten / Waging Nonviolence
One year after more than 1,200 people were arrested in front of the White House during two weeks of sit-ins against the Keystone XL tar sands oil pipeline, a coalition of Texas landowners and activists will attempt to physically halt its construction. Led by veteran climate justice organizers, participants ranging from environmentalists to Tea Partiers are preparing to lock arms for a sustained nonviolent civil disobedience campaign, beginning perhaps as early as this week.
The impetus for such action, which is being called the Tar Sands Blockade, goes back much further than last summer, however. In 2008 and 2009, small landowners along the pipeline’s route in rural Texas, Oklahoma and Nebraska started noticing survey stakes with orange tape marked “KXL.” They soon found out that TransCanada — the company building the pipeline — had eminent domain power over their property and that if they didn’t sign a contract allowing TransCanada to build, they would be taken to court.
Many landowners, feeling pushed into an impossible situation, signed the contracts. Some began organizing, doing community outreach to explain what was happening and building conservative support on the ground. Organizations such as Nacogdoches Stop Tarsands Oil Pipelines evolved out of conversations between landowners — first focusing around eminent domain, but then, when they learned that tar sands oil would be pumped through the pipeline, discussion started to include environmental impacts, such as toxic diluted bitumen and climate change.
By August 2011, the climate movement in the United States started to focus in on the Keystone XL with Tar Sands Action, a civil disobedience campaign led by Bill McKibben and members of 350.org. The 1,253 arrests in front of the White House helped raise the issue to a national level by stressing that President Obama could stop the pipeline by rejecting its permit to cross the U.S.–Canada border.
Weeks later, the Occupy movement emerged. While environmental issues were not at the forefront, many Occupy encampments passed resolutions opposing Keystone XL and took part in Tar Sands Action’s next rally in Washington, D.C., when, on November 6, 12,000 people encircled the White House. Days later President Obama denied the permit and, for the moment, Keystone XL was thought dead.
TransCanada then changed tactics and decided to split the pipeline into segments so that it could get a head start on construction while making inside deals in Washington to secure the necessary permit for crossing the border. In a sign of goodwill to the fossil fuel industry, President Obama went to Cushing, Oklahoma, and declared that he would “expedite” the permitting process for the Gulf Coast segment from Cushing to Houston and Port Arthur, Texas. While that ability was technically outside of his reach, it was a hint to the agencies responsible for such decisions. Perhaps not surprisingly, the Army Corps of Engineers then granted the three permits TransCanada needed to start construction — despite the absence of an environmental review.
The southern segment of the Keystone XL will be built in three different sections, simultaneously, with the goal of transporting tar sands oil currently stored in Cushing, Oklahoma, to refineries on the Gulf Coast, where it then can be shipped around the world. When Texas activists such as myself learned that this was happening despite the Tar Sands Action victory, we decided to form Tar Sands Blockade.
While landowners began organizing along the pipeline route in early 2012, climate justice activists with Rising Tide North Texas were looking for ways to bring wider attention to the pipeline’s impending construction. Many of us had been active Occupiers during the encampments and were disappointed with the movement’s inability to make the connection between economic justice and the climate. So we made a stronger effort to engage people on the community level.
As a result, Tar Sands Blockade is being informed by a variety of voices — from self-identified Tea Party members, flying Gadsden flags at the front of their long driveways, to Occupiers who slept at encampments across the country.
Several organizers with Tar Sands Blockade also participated in and organized for Tar Sands Action, including veteran climate justice activists from around the country. This diverse coalition has agreed on one simple call to action: The Keystone XL should not be built in Texas, and nonviolent direct action is required to stop it.
Other means of addressing the grievances of landowners and meeting the challenge of climate change have thus far failed. As Bill McKibben’s recent article “Global Warming’s Terrible New Math” made clear, the world has years, not decades, to confront the fossil fuel industry head on. Nonviolent direct action offers the best chance of victory, not just for the Tar Sands Blockade but for other fossil fuel extraction movements, such as those opposing fracking, mountaintop removal and coal exports — all of which have been active in what’s being called a Climate Summer of Solidarity.
That solidarity will take on greater meaning in a matter of days when construction on the pipeline is expected to begin and landowners will be bringing ice to the encampments to help alleviate the extreme Texas heat, as well as thanking everyone for defending the home they’ve built over decades. Activists will respond by holding the blockade for as long as possible, through the summer and likely into the fall. This could be an important moment for the entire climate movement, setting the stage for future actions and alliances — not to mention giving new meaning to the words “Don’t mess with Texas.”
From Waging Nonviolence: http://wagingnonviolence.org/2012/08/dont-mess-with-texas-tar-sands-blockade/
by Deep Green Resistance News Service | Aug 7, 2012 | Climate Change
By Jeremy Hance / Mongabay
A recent rise in deadly, debilitating, and expensive heatwaves was caused by climate change, argues a new statistical analysis published in the Proceedings of the National Academy of Sciences (PNAS). Climatologists found that extreme heatwaves have increased by at least 50 times during the last 30 years. The researchers, including James Hansen of NASA, conclude that climate change is the only explanation for such a statistical jump.
“This is not a climate model or a prediction but actual observations of weather events and temperatures that have happened,” Hansen, a prominent scientist and outspoken climate change activist, wrote in an op-ed in the Washington Post. “Our analysis shows that it is no longer enough to say that global warming will increase the likelihood of extreme weather and to repeat the caveat that no individual weather event can be directly linked to climate change. To the contrary, our analysis shows that, for the extreme hot weather of the recent past, there is virtually no explanation other than climate change.”
Between 1981 and 2010, extreme heatwaves covered 10 percent of the world, according to the paper, which is 50 to 100 times greater than the 0.1 percent to 0.2 percent of the Earth’s surface covered by extreme heat from 1951-1980. The analysis not only finds that extreme heatwaves (defined as over three standard deviations above the base period) have expanded due to a warming world, but that moderate heat (over half of a standard deviation) has more than doubled: jumping from 33 percent to 75 percent. Many climatologists refer to this phenomenon as “loading the climate dice.”
“In a normal climate without global warming, two sides of the die would represent cooler-than-normal weather, two sides would be normal weather, and two sides would be warmer-than-normal weather. Rolling the die again and again, or season after season, you would get an equal variation of weather over time,” Hansen explains in his op-ed. But now he says, climate change has shifted the dice: instead of only two sides being warmer than average, it should be four sides with one of those sides representing extreme heat.
“The climate dice are now loaded to a degree that a perceptive person old enough to remember the climate of 1951–1980 should recognize the existence of climate change, especially in summer,” the scientists write in the PNAS paper. Given their findings, the researchers also argue it is safe to say that recent heatwaves—like last year’s drought in Texas and Oklahoma, Russia’s heatwave and wildfires in 2010, and the European heatwave of 2003—were caused by climate change.
“[These events] almost certainly would not have occurred in the absence of global warming with its resulting shift of the anomaly distribution,” the scientists write. “In other words, we can say with high confidence that such extreme anomalies would not have occurred in the absence of global warming.”
