When the End of Human Civilization Is Your Day Job

In the photo: Glaciologist Jason Box, left, at work on the Petermann Glacier on Greenland’s northwest coast, which has lost mass at an accelerated pace in recent years. Box and his family left Ohio State for Europe a couple years ago, and he is relieved to have escaped America’s culture of climate-change denial.

Jason Box

The incident was small, but Jason Box doesn’t want to talk about it. He’s been skittish about the media since it happened. This was last summer, as he was reading the cheery blog posts transmitted by the chief scientist on the Swedish icebreaker Oden, which was exploring the Arctic for an international expedition led by Stockholm University. “Our first observations of elevated methane levels, about ten times higher than in background seawater, were documented … we discovered over 100 new methane seep sites…. The weather Gods are still on our side as we steam through a now ice-free Laptev Sea….”

As a leading climatologist who spent many years studying the Arctic at the Byrd Polar and Climate Research Center at Ohio State, Box knew that this breezy scientific detachment described one of the nightmare long-shot climate scenarios: a feedback loop where warming seas release methane that causes warming that releases more methane that causes more warming, on and on until the planet is incompatible with human life. And he knew there were similar methane releases occurring in the area. On impulse, he sent out a tweet.

“If even a small fraction of Arctic sea floor carbon is released to the atmosphere, we’re f’d.”

The tweet immediately went viral, inspiring a series of headlines:

CLIMATOLOGIST SAYS ARCTIC CARBON RELEASE COULD MEAN “WE’RE FUCKED.”

CLIMATE SCIENTIST DROPS THE F-BOMB AFTER STARTLING ARCTIC DISCOVERY.

CLIMATOLOGIST: METHANE PLUMES FROM THE ARCTIC MEAN WE’RE SCREWED.

Box has been outspoken for years. He’s done science projects with Greenpeace, and he participated in the 2011 mass protest at the White House organized by 350.org. In 2013, he made headlines when a magazine reported his conclusion that a seventy-foot rise in sea levels over the next few centuries was probably already “baked into the system.” Now, with one word, Box had ventured into two particularly dangerous areas. First, the dirty secret of climate science and government climate policies is that they’re all based on probabilities, which means that the effects of standard CO2 targets like an 80 percent reduction by 2050 are based on the middle of the probability curve. Box had ventured to the darker possibilities on the curve’s tail, where few scientists and zero politicians are willing to go. More

 

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Who Will Answer Our Children?

The Next Generation Asks World Leaders at UN Climate Summit 2014: Why Not Act on Climate Change?

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Putting Climate Polluters in the Dock

Can Caribbean governments take legal action against other countries that they believe are warming the planet with devastating consequences?

A former regional diplomat argues the answer is yes. Ronald Sanders, who is also a senior research fellow at London University, says such legal action would require all Small Island Developing States (SIDS) acting together.

He believes the Hague-based International Court of Justice (ICJ) would be amenable to hearing their arguments, although the court’s requirement that all parties to a dispute agree to its jurisdiction would be a major stumbling block.

“It is most unlikely that the countries that are warming the planet, which incidentally now include India and China, not just the United States, Canada and the European Union…[that] they would agree to jurisdiction,” Sanders told IPS.

“The alternative, if countries wanted to press the issue of compensation for the destruction caused by climate change, is that they would have to go to the United Nations General Assembly.”

Sanders said that the Caribbean Community (CARICOM) countries could “as a group put forward a resolution stating the case that they do believe, and there is evidence to support it, that climate change and global warming is having a material effect… on the integrity of their countries.

“We’re seeing coastal areas vanishing and we know that if sea level rise continues large parts of existing islands will disappear and some of them may even be submerged, so the evidence is there.”

Sanders pointed to the damaging effects of flooding and landslides in St. Vincent and the Grenadines, St. Lucia, and Dominica as 2013 came to an end.

The prime minister of St. Vincent and the Grenadines, Dr. Ralph Gonsalves, described the flooding and landslides as “unprecedented” and gave a preliminary estimate of damage in his country alone to be in excess of 60 million dollars.

“People who live in the Caribbean know from their own experience that climate change is real,” Sanders said.

“They know it from days and nights that are hotter than in the past, from more frequent and more intense hurricanes or freak years like the last one when there were none, from long periods of dry weather followed by unseasonal heavy rainfall and flooding, and from the recognisable erosion of coastal areas and reefs.”

At the U.N. climate talks in Warsaw last November, developing countries fought hard for the creation of a third pillar of a new climate treaty to be finalised in 2015. After two weeks and 36 straight hours of negotiations, they finally won the International Mechanism for Loss and Damage (IMLD), to go with the mitigation (emissions reduction) and adaptation pillars.

The details of that mechanism will be hammered out at climate talks in Bonn this June, and finally in Paris the following year. As chair of the Alliance of Small Island States (AOSIS), Nauru will be present at a meeting in New Delhi next week of the BASIC group (Brazil, South Africa, India and China) to try and build a common platform for the international talks.

“It isn’t just the Caribbean, of course,” Sanders said. “A number of other countries in the world – the Pacific countries – are facing an even more pressing danger than we are at the moment. There are countries in Africa that are facing this problem, and countries in Asia,” he told IPS.

“Now if they all join together, there is a moral case to be raised at the United Nations and maybe that is the place at which we would more effectively press it if we acted together. It would require great leadership, great courage and great unity,” he added.

Pointing to the OECD countries, Sir Ronald said they act together, consult with each other and come up with a programme which they then say is what the international standard must be and the developing countries must accept it.

“Why do the developing countries not understand that we could reverse that process? We can stand up together and say look, this is what we are demanding and the developed countries would then have to listen to what the developing countries are saying,” Sir Ronald said.

Following their recent 25th inter-sessional meeting in St. Vincent, Jamaican Prime Minister Portia Simpson Miller praised the increased focus that CARICOM leaders have placed on the issue of climate change, especially in light of the freak storm last year that devastated St. Lucia, Dominica and St. Vincent and the Grenadines.

At that meeting, heads of government agreed on the establishment of a task force on climate change and SIDS to provide guidance to Caribbean climate change negotiators, their ministers and political leaders in order to ensure the strategic positioning of the region in the negotiations.

In Antigua, where drought has persisted for months, water catchments are quickly drying up. The water manager at the state-owned Antigua Public utilities Authority (APUA), Ivan Rodrigues, blames climate change.

“We know that the climate is changing and what we need to do is to cater for it and deal with it,” he told IPS.

But he is not sold on the idea of international legal action against the large industrialised countries.

“I think what will cause [a reversal of their practices] is consumer activism,” he said. “The argument may not be strong enough for a court of law to actually penalise a government.”

But Sanders firmly believes an opinion from the International Court of Justice would make a huge difference.

“We could get an opinion. If the United Nations General Assembly were to accept a resolution that, say, we want an opinion from the International Court of Jurists on this matter, I think we could get an opinion that would be favourable to a case for the Caribbean and other countries that are affected by climate change,” he told IPS.

“If there was a case where countries, governments and large companies knew that if they continue these harmful practices, action would be taken against them, of course they would change their position because at the end of the day they want to be profitable and successful. They don’t want to be having to fight court cases and losing them and then having to pay compensation,” he added. More

 

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Antarctica's ice collapse threatens metres of sea level rise within decades

Scientists know that if Antarctica's ice sheets and glaciers collapse, sea levels could rise 5 metres. But the idea that it will take 200 years to happen is based on a linear model, writes Dady Cherry. In fact, the process is exponential - and could take place 'within decades'.

We conclude that this sector of West Antarctica is undergoing a marine ice sheet instability that will significantly contribute to sea level rise in decades to come.

Imagine further that a thick layer of ice covers, not only the surface of the island that lies above the sea but also an extensive portion of the perimeter that is beneath the sea.

The peaks are higher above sea level than on any continent. In winter, the sea freezes because temperatures drop to less than -80 degrees Celsius (-112 degrees Farenheight), and the island's area grows to about 10 million square miles.

In summer when some of the ice melts, the ice cover remains on average more than a mile thick, although the overall surface area of the island shrinks to about 5 million square miles. Even in summer, however, the island is still larger than Europe or Australia. It is Antarctica, and it is impossible to imagine.

When glaciers no longer rest on bedrock, they are doomed

So let us instead consider an island that is a large glacier with a thick cover of ice that extends outward, well beyond its land area. The island is shaped roughly like an infinity symbol, with the right (east) side much larger than the left (west).

The west side is really a peninsula and archipelago that share a common bedrock, but this is invisible because of the ice cover. What we can see is that even at the perimeter, where there is no land above sea level, there is ice. In some places, the ice reaches down, well beneath the water surface, all the way to the bedrock.

This situation is unstable, because in principle, the mass of ice that is beneath the sea and in continuous contact with liquid water should eventually melt. When it does, this initially leaves an overhanging shelf of ice over the water at the island's perimeter.

Being less dense than water, this shelf will want to float up and, given enough time, will eventually break away from the more interior ice that is pinned to land above sea level. Indeed, about 40% of Antarctica's perimeter consists of such ice shelves. In another 40% of the perimeter, the ice cover reaches all the way down to the bedrock.

An uncomfortable equilibrium is coming to an end

Island, ice and sea have coexisted for millennia in an uncomfortable equilibrium. In particular, the sea temperatures have not grown sufficiently warm to erode the ice edge irreversibly.

Furthermore, the mass of ice on the surface has remained relatively constant, with the seasonal flows of water out to sea in the summer being replaced by deposits of ice in winter.

The ice shelves have not thinned sufficiently to become so weak that they would snap and float away out to sea. This was all before the one-degree Celsius warming in the Earth's surface since around 1980.

Currently, the warmer seawater is eroding the island's submerged perimeter of ice. Simultaneously, the warmer air is also melting the ice cover at such an accelerated rate that it cannot be entirely replaced in the winters.

The process is irreversible

Once both kinds of erosion become irreversible, meaning that no net ice is replaced, the ice mass will shrink and become more and more bare, in a process that will accelerate out of control until the ice appears suddenly to vanish.

This is more or less the story that Eric Rignot and his colleagues reported about West Antarctica in a Geophysical Research Letters article that was accepted for publication on May 12, 2014.

They used satellite-based radar interferometry to map the edges of a series of glaciers that drain into a large bay called the Amundsen Sea Embayment, and combined their data with the results of other kinds of surveys.

Beating a rapid retreat

They discovered that between 1992 and 2011:

• Thwaites Glacier retreated 8.7 miles (14 km) at its core and zero to six miles (1 to 9 km) at its edges,
• Haynes Glacier retreated 6 miles (10 km) at its edges,
• Smith / Kohler Glacier retreated about 22 miles (35 km), and its ice shelf is barely pinned to the surface.
• Pine Island Glacier retreated 19 miles (31 km) at its center and snapped and detached from the ground.

All these retreats occurred mostly between 2005 to 2009. The authors note that they must have had a common cause and that the most reasonable explanation is the general warming of the ocean. They further explain that there is no natural land mass to prevent the movement of the massive glaciers out to sea. They conclude:

"The retreat is proceeding along fast-flowing, accelerating sectors that are thinning, become bound to reach floatation and un-ground from the bed.

"We find no major bed obstacle upstream of the 2011 grounding lines that would prevent further retreat of the grounding lines farther south.

"We conclude that this sector of West Antarctica is undergoing a marine ice sheet instability that will significantly contribute to sea level rise in decades to come."

In other words, the disappearance of West Antarctic ice is well under way, and it is irreversible.

The melting is exponential, not linear

It is notable that this research was done under difficult circumstances. For example, the authors write that, since 2001, the ERS-2 satellite has operated without its gyroscopes, and "This made it difficult to control the antenna pointing ... ".

They further observe that "In July 2011, ERS-2 terminated its mission after 16 years of services, far exceeding its planned operational lifespan."

In addition, they make a point of acknowledging "two anonymous reviewers for their comments." Possibly, the report was delayed, and some of its more frightening arguments had to be removed before publication.

In a later publication for the general public, Rignot stressed that the estimate of 200 years for the Radmunsen sea collapse, which has been repeated again and again in the press, is based on the melting continuing at its current rate.

This we know to be impossible because the melting is an exponential process that has been accelerating all the time and will continue to accelerate even more.

How long before sea rise is catastrophic?

The acceleration is driven, among other things, by an accelerated warming of the atmosphere and sea surface, continued expansion of the ozone hole, strengthening of currents that bring greater masses of warm waters from the tropics to Antarctica, weakening of the ice shelves due to accelerated melting of the surface ice, weakening of the attachment of the ice below sea level due to an accelerated erosion, and decreasing reflectivity of the Earth.

With regard to climate change, again and again, exponential processes have been treated as if they would develop linearly, despite scientists knowing quite well that they would not. Consider for example, a storm that is approaching your house from six miles away.

The storm is currently moving at five miles per hour, but it is expected to double its speed with every new mile. Do you make sure to have cover within one hour and 12 minutes, or within about 22 minutes?

Again and again, scientists have done the equivalent of feigning surprise when their timelines, based on a completely bogus linearity, have turned out to be too long. Things have gone much too far for us to continue to play such numbers' games.

West Antarctic ice sheet could raise sea levels 5m 'within decades'

Rignot blames carbon emissions, which have tripled since the Kyoto Protocol, for the current state of affairs, and he categorically says that the collapse of the ice cover from "the Amundsen sea sector of West Antarctica [is] unstoppable, with major consequences - it will mean that sea levels will rise one metre [more than 3 feet] worldwide.

"What's more, its disappearance will likely trigger the collapse of the rest of the West Antarctic ice sheet, which comes with a sea level rise of between three and five metres [10 to more than 16 feet]. Such an event will displace millions of people worldwide."

The sea-level rise of 10 to 16 feet will come in decades, rather than 200 years. It will submerge essentially every port city in the world, including Guangzhou, Mumbai, Shanghai, Ho Chi Minh City, Kolkata, Osaka-Kobe, Alexandria, New York, New Orleans, Miami, and indeed all of South Florida.

This will likely displace over 300 million people, many of them in countries that have equated development with movement of the majority of their populations to low-elevation coastal zones in port cities.

What other impacts will follow?

The displacement and homelessness from the changes in sea level might be the least of humanity's problems. More

 

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Climate Change Will Force Us to Abandon Coastal Cities

On Monday, the New York Times reported on two new climate change studies that came to the same, terrifying conclusion: “The heat-trapping gases could destabilize other parts of Antarctica as well as the Greenland ice sheet, potentially causing enough sea-level rise that many of the world’s coastal cities would eventually have to be abandoned.”

Abandoned.

While actual abandonment would not happen for many years (we’re talking centuries), the studies warned that our actions now are irrevocable and will lock in these future sea level rises. In other words, our descendants will be dealing with irreversible damage that we are committing today.

So, fast forward a few centuries from now, what will the world look like? What will the United States look like? Will people still live in Miami? Boston? New York? We don’t know what technology we will have then and we aren’t able to predict the pattern of storms. We do know that sea levels are rising and will threaten cities along the coasts of the United States.

“Barring some extraordinary advances in technology that we currently do not foresee,” Robert Hartwig, the president of the Insurance Information Institute, said, “you are left with the options of retreating from coastal areas not only in the United States, but around the world, or building fortifications against rising sea levels that would make the projects that we now see in places like the Netherlands look like child’s play.”

The Dutch government has set aside one billion euros a year through 2100 to strengthen dunes and dams throughout the country. Due to its low-lying position, the Netherlands is one of the most at-risk countries and has already crafted a long-term strategy to ensure the country’s survival. But in the United States, where one of our two main political parties remains skeptical about man-made climate change, such planning is unlikely to happen.

“If you have a plan and vision to stay there it is more likely to occur,” Robert Nicholls, a professor of coastal engineering at the University of Southampton, wrote in an email. “But USA does not have a planning culture.”

Planning will not come cheap. The mitigation techniques needed to fortify a city like Miami will cost billions of dollars, if not more. State and local governments will undoubtedly turn to the federal government for help, but that will be a political nightmare. Americans from non-coastal regions will likely object to paying for the restoration and fortification of coastal cities that are no longer naturally fit for habitation.

“Ultimately, reality will set in in the United States too, despite it being a relatively wealthy country,” Hartwig said. “Some areas will necessarily be abandoned or potentially become, in effect, islands. That’s another possibility. You say to yourself, do I abandon Miami or do I simply wall in a certain number of square miles of what is currently Miami and in effect create an island?

“Resources are always scarce and there are going to be many in the United States who think spending every available dime of every available tax dollar to save people from rising sea levels on the coast is a complete waste of money,” Hartwig added. “And they will have a point, because they’re paying tax dollars in Missouri or in North Dakota and they will not directly see a return on this investment.”

Global warming poses risks besides rising sea level. Severe storms may increase in frequency, although it’s difficult to predict how they will play out. Saltwater intrusion could imperil farm land up the Mississippi River. Droughts may become more common. Already now, scientists are wondering whether we’ve reached Peak Phosphorus—the point at which we reach the maximum global production rate of phosphorus, an essential fertilizer for crops.

Colin Green, a professor of water economics at Middlesex University, wrote in an email that he tells his students three things: “(1) they will not be able to retire until they are 75; (b) they will need to become vegetarians because we don't have enough water to support a high meat based diet; and (c) that when they go to the supermarket, they will need to take their urine with them which will be analysed and then they will be able to buy food with the same phosphorus content as the urine they bought in.”

The consequences of our inaction today will not be fixable down the road, no matter how much money the government spends. Instead, we will focus on containing the damage, whether through mitigation or abandonment. Insurance will be an important tool to allow the government to spread around some of that risk. But that assumes insurers don’t deem certain areas uninsurable—and that in turn depends on what we do today.

“I would say that if you look at the gradual sea level rise predicted over the next century, provided appropriate mitigation on the structures and in the communities in the higher cities are undertaken, then insurance is possible in these areas albeit at higher costs,” Hartwig said.

In some cases, the federal government may sell the insurance. For instance, right now, the feds offer subsidized flood insurance to homeowners in at-risk areas. When Congress passed the Biggert-Waters Act in 2012 to allow those rates to rise to their market level, they faced a swift backlash from homeowners who were going to see their insurance rates skyrocket. Led by congressmen from Gulf states, Congress gutted the bill in March. If that is any sign of what is to come, then policymakers are not prepared for the infinitely higher costs and tough choices they will face down the road. More

 

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Doomed Pine Island Glacier Releases Guam-Sized Iceberg into Southern Ocean

Science has confirmed it. Human-caused warming is killing Antarctica’s massive Pine Island Glacier (PIG). And this week’s release of a chunk of ice larger than Guam into the southern ocean is just one of the many major losses that will occur as part of what is now an inevitable demise of one of the world’s greatest glaciers.

The iceberg calved from Antarctica's Pine Island Glacier last November, according to NASA. The crack that produced it was first spotted in 2011. Since November, B31 has drifted out of Pine Island Bay and into the Amundsen Sea off the western side of the continent. 'The iceberg is now well out of Pine Island Bay and will soon join the more general flow in the Southern Ocean, which could be east or west in this region," iceberg researcher Grant Bigg from the University of Sheffield in England said in the NASA statement. Once that happens, the researchers worry it will be difficult track the iceberg during the long weeks of darkness that comprise the Antarctic winter. And don't expect it to melt. An iceberg of that size could hang around for a year or more, Robert Marsh, a scientist at the University of Southampton in England, said last year. The largest iceberg ever recorded was called B15. With an area of 4,250 square miles -- about the size of the state of Connecticut or the island of Jamaica - it calved off Antarctica's Ross Ice Shelf in March 2000. B15 has since broken up, but parts of it still exist around the Antarctic today.

Heat-Charged Blow to The Soft Underbelly of Antarctic Ice Shelves

As human greenhouse gas emissions caused the world’s oceans to warm, upwelling currents delivered a portion of that heat to the continental shelf zone surrounding Antarctica. A fortress of ice, numerous glacial ice shelves thrust out from this frozen land and drove deep into the sea floor. Ocean-fronting glaciers featured submerged sections hundreds of feet below the sea surface.

The warming currents encountered these massive ice faces, eroding their undersides and providing pathways for ocean waters to invade many miles beneath the glaciers. These invasions subjected the vulnerable ice shelves not only to the heat forcing of an ever-warming ocean, but also to wave and tidal stresses. The reduction in grounding and the constant variable stresses set the glaciers into a rapid seaward motion.

Antarctica’s most vulnerable glaciers lie along its western out-thrust. Two, Thwaites and the Pine Island Glacier, have recently seen very rapid increases in forward speed. Of these, the Pine Island Glacier, according to a recent study, is undergoing the process of an irreversible collapse. What this means is that the glacier’s speed of forward motion is now too great to be halted. Inevitably, even if the climate were to cool, the entire giant glacier will be launched into the world’s oceans where it will entirely melt out.

Guam-Sized Chunk of Ice to be One of Many

The Pine Island Glacier is massive, covering a total area of 68,000 square miles and, in some locations, rising to over 2,000 feet in height. It represents 10% of all the ice in the West Antarctic Ice Sheet, holding enough liquid water to raise sea levels by between 1 and 2.5 feet all on its own. And the now destabilized PIG is bound to put added stresses on the adjacent Thwaites glacier together with almost the entire West Antarctic ice system. Over recent years, PIG’s forward speed has accelerated. Increasing forward velocity by 73 percent from 1974 to 2007. Surveys made since that time show an even more rapid pace. By January of this year, studies were finding that PIG had entered a sate of irreversible collapse. So it is little wonder that enormous chunks of ice are breaking off from this massive glacier and drifting on out into the Southern Ocean.

As of early this week, the immense ice island dubbed B31 measuring 12×24 miles in size (nearly 290 square miles), slid off its temporary grounding on the sea bottom and began its journey out into the Southern Ocean. There it will remain for years, plaguing the world’s shipping lanes as it slowly disintegrates into a flotilla of icebergs. It is just the most recent event in the now ongoing decline of PIG. And we can expect many, many more major ice releases as this vast Antarctic glacier continues its dive to the sea. More

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New climate change feedback increasing extreme weather

New climate change feedback increasing extreme weather.

Published on Apr 6, 2014 •

From December, 2013 until early April, 2014 there have been persistent and very large temperature anomalies in the northern hemisphere (+20 C = +36 F in the Arctic, -20 C = -36 F in vast parts of the US and Canada). I claim that this represents a previously unrecognized large positive feedback acting to homogenize the temperature in the northern hemisphere.

 

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Climate Change Occurring Ten Times Faster Than at Any Time in Past 65 Million Years

If the trend continues at its current rapid pace, it will place significant stress on terrestrial ecosystems around the world, and many species will need to make behavioral, evolutionary or geographic adaptations to survive.

Although some of the changes the planet will experience in the next few decades are already "baked into the system," how different the climate looks at the end of the 21st century will depend largely on how humans respond.

The findings come from a review of climate research by Noah Diffenbaugh, an associate professor of environmental Earth system science, and Chris Field, a professor of biology and of environmental Earth system science and the director of the Department of Global Ecology at the Carnegie Institution. The work is part of a special report on climate change in the current issue of Science.

Diffenbaugh and Field, both senior fellows at the Stanford Woods Institute for the Environment, conducted the targeted but broad review of scientific literature on aspects of climate change that can affect ecosystems, and investigated how recent observations and projections for the next century compare to past events in Earth's history.

For instance, the planet experienced a 5 degree Celsius hike in temperature 20,000 years ago, as Earth emerged from the last ice age. This is a change comparable to the high-end of the projections for warming over the 20th and 21st centuries.

The geologic record shows that, 20,000 years ago, as the ice sheet that covered much of North America receded northward, plants and animals recolonized areas that had been under ice. As the climate continued to warm, those plants and animals moved northward, to cooler climes.

"We know from past changes that ecosystems have responded to a few degrees of global temperature change over thousands of years," said Diffenbaugh. "But the unprecedented trajectory that we're on now is forcing that change to occur over decades. That's orders of magnitude faster, and we're already seeing that some species are challenged by that rate of change."

Some of the strongest evidence for how the global climate system responds to high levels of carbon dioxide comes from paleoclimate studies. Fifty-five million years ago, carbon dioxide in the atmosphere was elevated to a level comparable to today. The Arctic Ocean did not have ice in the summer, and nearby land was warm enough to support alligators and palm trees.

"There are two key differences for ecosystems in the coming decades compared with the geologic past," Diffenbaugh said. "One is the rapid pace of modern climate change. The other is that today there are multiple human stressors that were not present 55 million years ago, such as urbanization and air and water pollution."

Record-setting heat

Diffenbaugh and Field also reviewed results from two-dozen climate models to describe possible climate outcomes from present day to the end of the century. In general, extreme weather events, such as heat waves and heavy rainfall, are expected to become more severe and more frequent.

For example, the researchers note that, with continued emissions of greenhouse gases at the high end of the scenarios, annual temperatures over North America, Europe and East Asia will increase 2-4 degrees C by 2046-2065. With that amount of warming, the hottest summer of the last 20 years is expected to occur every other year, or even more frequently.

By the end of the century, should the current emissions of greenhouse gases remain unchecked, temperatures over the northern hemisphere will tip 5-6 degrees C warmer than today's averages. In this case, the hottest summer of the last 20 years becomes the new annual norm.

"It's not easy to intuit the exact impact from annual temperatures warming by 6 C," Diffenbaugh said. "But this would present a novel climate for most land areas. Given the impacts those kinds of seasons currently have on terrestrial forests, agriculture and human health, we'll likely see substantial stress from severely hot conditions."

The scientists also projected the velocity of climate change, defined as the distance per year that species of plants and animals would need to migrate to live in annual temperatures similar to current conditions. Around the world, including much of the United States, species face needing to move toward the poles or higher in the mountains by at least one kilometer per year. Many parts of the world face much larger changes.

The human element

Some climate changes will be unavoidable, because humans have already emitted greenhouse gases into the atmosphere, and the atmosphere and oceans have already been heated.

"There is already some inertia in place," Diffenbaugh said. "If every new power plant or factory in the world produced zero emissions, we'd still see impact from the existing infrastructure, and from gases already released."

The more dramatic changes that could occur by the end of the century, however, are not written in stone. There are many human variables at play that could slow the pace and magnitude of change -- or accelerate it.

Consider the 2.5 billion people who lack access to modern energy resources. This energy poverty means they lack fundamental benefits for illumination, cooking and transportation, and they're more susceptible to extreme weather disasters. Increased energy access will improve their quality of life -- and in some cases their chances of survival -- but will increase global energy consumption and possibly hasten warming. More

 

Melting Permafrost Found in Antarctica's Dry Valleys

Antarctica's Dry Valleys are home to the oldest ice on Earth. The first signs of the massive thaw disturbing the Arctic's frozen ground have now appeared in one of these valleys, melting a glacier buried since the last Ice Age.

Antarctic Dry Valley

The Dry Valleys are different from the rest of Antarctica. Their ice, some of which is millions of years old, is buried under scoured boulders and dust as fine as flour. The arid landscape looks like Mars and, until now, hadn't changed much since the continent froze about 15 million years ago.

"The Dry Valleys range from being somewhat stable to extremely stable in terms of landscape," said Joseph Levy, a research associate at the University of Texas at Austin's Institute for Geophysics.

But in 2009, Levy said, helicopter pilot Dustin Black spotted a new feature in Garwood Valley, one of the Dry Valleys near McMurdo Research Station where he ferries scientists to and from research camps. "I discovered this huge chunk of buried ice that was beginning to melt," Levy told LiveScience. "It was changing, and changing fast." [Images of Melt: Earth's Vanishing Ice]

The melting ice is a stranded glacier, buried under lake and river sediments for at least 7,000 years. In the past few years, the thawing ground has formed a 50-foot-tall (15 meters) ice cliff that's retreated by 30 feet (10 m), according to a study led by Levy published today (July 24) in the journal Nature Scientific Reports. The thawing ground is melting as quickly as Arctic permafrost, Levy said. Permafrost, or permanently frozen ground, covers about 25 percent of the Northern Hemisphere, and some is thawing in warming regions.

A crumbling ice cliff

"We're seeing the first Arctic-style change to the permafrost in Antarctica, and it's exciting and a little bit scary," Levy said. "The Dry Valleys are host to a lot of very special climate records, and when the ice melts, it's like someone going into a laboratory and breaking all of your experiments."

Ice cliff erosion since 2001. The solid white lines indicate infrared radiometer and sonic ranger field of view. The dashed line indicates the area of erosion between the initial ice and sediment deposition (Pleistocene/Holocene epochs) and 2001.

Credit: Joseph Levy, University of Texas Institute for Geophysics.

View full size image

The unique Dry Valley ecosystem — which has adapted to the harsh, dry climate —could also be affected by the sudden influx of meltwater, Levy said.

In 2001, the study's baseline, about 2,800 cubic feet (80 cubic meters) of ice and sediment melted out of the buried glacier, the researchers found. Between January 2011 and January 2012, more than 388,000 cubic feet (11,000 cubic m) of the ice cliff disappeared.

"You can see giant blocks calving off and tumbling down the cliff," Levy said.

Before the discovery, scientists thought the Dry Valleys were a sea of stability in the rapidly changing polar regions — seasonal freeze and thaw cycles neither added nor took away from the underlying permafrost. And unlike regions of Antarctica that are warming, temperatures in the Dry Valleys stayed the same or cooled in the past 20 years.

The sun shines in

But in their search to explain the sudden melting in Garwood Valley, Levy and his colleagues found one weather shift in the valley. For still-unknown reasons, the U-shaped gorge is baking under more intense sunlight. Weather stations record increased sunlight in the valley in recent years, which means more solar radiation is heating the thin, dark blanket of dirt on top of the frozen ground. The ice is effectively cooking underneath.

"Right now, we have the observations that we are getting more sunshine reaching the ground, but we don't have a good model as to why," Levy said.

He added that it's unlikely that all of Antarctica's Dry Valleys will start melting to the extent seen in Garwood Valley. Some have thicker sediment layers that insulate permafrost, instead of absorbing and transmitting heat. "There are parts of the deep interior Dry Valleys that seem very resistant to melting," Levy said. More

 

Antarctic bottom water disappearing

New research by teams of Australian and US scientists has revealed a massive reduction in the amount of Antarctic Bottom Water found off the coast of Antarctica.

Argo Float

Comparing detailed measurements taken during the Australian Antarctic program’s 2012 Southern Ocean marine science voyage, to historical data dating back to 1970, scientists estimate there has been as much as a 60% reduction in the volume of Antarctic Bottom Water – the cold dense water that drives global ocean currents.

In an intensive 25-day observing program in January this year, temperature and salinity samples were collected at 77 sites between Antarctica and Fremantle (Western Australia). Such ship transects provide the only means to detect changes in the deep ocean.

The new measurements suggest the densest waters in the world ocean are gradually disappearing and being replaced by less dense waters. These measurements concur with a recent study by US-based researchers which showed that Antarctic Bottom Water is contracting over much of the global ocean. The ocean profiles also show that the dense water formed around Antarctica has become less saline since 1970.

‘It’s a clear signal to us that the oceans are responding rapidly to variations in climate in polar regions,’ Voyage Leader and Chief Scientist, Dr Steve Rintoul, said.

‘The sinking of dense water around Antarctica is part of a global pattern of ocean currents that has a strong influence on climate, so evidence that these waters are changing is important.’

Dr Rintoul, an oceanographer with the CSIRO and the Antarctic Climate and Ecosystems Cooperative Research Centre, led the scientific voyage from Hobart, south to Commonwealth Bay, before turning west along the Antarctic coast and returning to Fremantle. The ship visited Commonwealth Bay as part of a celebration of the centenary of Sir Douglas Mawson’s Australasian Antarctic Expedition. Dr Rintoul’s team had the opportunity to repeat oceanographic measurements made by Mawson’s team 100 years ago, obtaining one of the few century-long records obtained anywhere in the ocean.

‘Our measurements collected in 2012 are quite different to those collected by Mawson in 1912,’ Dr Rintoul said.

‘The water is cooler now than it was then, indicating a change in ocean currents that may be related to a reduction in the amount of dense water formed near Antarctica – as less dense water is exported, less warm water flows into the region to replace it.

‘When we speak of global warming, we really mean ocean warming: more than 90% of the extra heat energy stored by the earth over the last 50 years has gone into warming up the ocean.

‘The Southern Ocean is particularly important because it stores more heat and carbon dioxide released by human activities than any other region, and so helps to slow the rate of climate change. A key goal of our work is to determine if the Southern Ocean will continue to play this role in the future.’

The causes of the observed changes in the Southern Ocean are not yet fully understood. Changes in winds, sea ice, precipitation, or melt of floating glacial ice around the edge of Antarctica, may be responsible. Data collected on the latest voyage will help unravel this mystery.

A major challenge is the lack of observations at high latitude, where much of the ocean is covered by sea ice in winter. During the voyage, scientists deployed nine drifting profilers, called Argo floats, which will transmit profiles of temperature and salinity every 10 days for the next five years.

‘The Argo floats have revolutionised our ability to measure the ocean, particularly in winter when ship observations are very rare,’ Dr Rintoul said. More

 

Business as usual could result in sea level rise of up to seven metres - Club of Rome

Only a complete overhaul of our economic growth and international negotiations can prevent sea level rises that will destroy coastal cities like New York and London experts warn

New York, USA, 28 April: Energy expert Ian Dunlop and policy-planner and scholar Tapio Kanninen delivered a stark message in New York at the end of April that even limiting global warming to 2°C could eventually produce sea level rises of up to 6 to 7 metres (23 feet), wiping out coastal cities like New York, London, Shanghai and Tokyo. They told shocked audiences at the United Nations that if we continue with current policies, temperatures could rise 4°C or more, leading to sea level rises of up to 70 metres (230 feet).

Kanninen and Dunlop were in New York to address a series of packed meetings and panel discussions, organised by the Finnish Mission to the United Nations,Friedrich-Ebert-Stiftung, the Club of Rome, the Temple of Understanding and the UN Department of Economic and Social Affairs.

They presented new evidence demonstrating the severity of the crisis of global sustainability and global survivability and discussed with diplomats, political decision‐makers, sustainable development experts and NGOs how to persuade the UN and other international institutions to take immediate emergency action.

Commenting on recent scientific findings, Ian Dunlop - with over 30 years’ experience at the Royal Shell Group as engineer and senior executive and a former leader of Australia's Emissions trading panel said: “Today’s leadersrefuse to accept that climate change science and the concept of peak oil condemns the international community to a catastrophic future. Why are we stillexploring for fossil fuels, since we can only burn of 20-30% of reserves if we wish to keep climate change to the 2 °C limit, while current policies will result in warming of4-6 °C?” he asked.

This level of temperature rise means that the globe can only carry 0.5-1 billion people, not the present 7 billion, leading experts evaluate.

Tapio Kanninen, a former long time UN staff member and policy-planner, said that scientists have determined a number of "tipping points" that exponentially and dramatically accelerate global warming trends. As they begin to kick in, in a matter of years not decades, we must take action before it is too late to avert a catastrophe.

The severity of the global crisis goes unrecognised: we need a global emergency response and newpolicy models

Dr Kanninen said current international and nationalinstitutional and political systems are incapable of preventing the increasing severe global crises; it requires a change in the entire system plus an emergency response. If runaway climate change leads to rising sea levels the next move has to be to urgently overhaul the UN and our global governance system so it is capable of dealing with rapidly changing global and regional conditions.

Ian Dunlop said that many scientists and practitioners are wrongly dubbed ‘alarmist’, but diplomats, politicians and the whole intergovernmental system have failed to grasp the severity of the crisis. If we fail to act we could find ourselves like a ‘ship of fools’ floating on rising sea levels.

Failing to institute a major global policy change will inevitably lead to the gradual implosion of the economic, ecological and social structures on which we depend, andthey called for “An urgent joint effort by member states, NGOs and scholars to improve the quality of global negotiations on climate change and sustainable development”.

The Club of Rome raised similar issues 40 years ago and recent research has confirmed that its projections ofindustrial collapse in the early 21st century aresurprisingly close to actually data gathered. In his recent book Crisis of Global Sustainability Dr Kanninen evaluates the Club's history and impact, as well as describing the future global crisis if no action is taken.

Setting up new structures

Faced with the reality gap between what scientists predict and what politicians are prepared to do, part of the solution to global inertia lies in creating an independent Global Crisis Network of regional, national and local centres with a global coordination unit that will interact with a revamped UN. Eventually, the UN Charter has to be totally rewritten to correspond to thenew global reality.

The Club of Rome is an international think-tank, based in Switzerland, with 1500 members and over 30 National Associations. Its mission is to undertake forward-looking analysis and assessment on measures for a happier, more resilient, sustainable planet. www.clubofrome.org

The Limits to Growth, a 1972 report to the Club of Rome was written by Denis Meadows, Donella Meadows, Jorgen Randers and William Behrens III. It used computer models to project possible future scenarios with different assumptions of how humans would react to earth’s physical limitations.

Dr Tapio Kanninen is Senior Fellow at the Graduate Center of the City University of New York and a Co-Director of the Project on Sustainable Global Governance. He was Chief of the Policy Planning Unit in the Department of Political Affairs (1998–2005) at the United Nations and worked earlier to set up a global environmental statistical framework in a UNEP-funded project in the UN Statistical Division. He is a member of the Club of Rome.

Ian Dunlop is an Australian Energy Expert, a fellow to the Centre of Policy Development and a former senior executive at the Royal Dutch Shell Group. He is Chair of Safe Climate Australia, Deputy Convenor of the Australian Association for the Study of Peak Oil and a Club of Rome member.

Friedrich-Ebert-Stiftung is a German political foundation with over 100 offices around the world, including an active UN office. It is the Germany's oldest organisation to promote democracy, political education, and promote students of outstanding intellectual abilities.

The Temple of Understanding is an interfaith NGO working to promote global survivability, and an active member of the NGO community working on the inside of the United Nations to advance social justice.

Crisis of Global Sustainability is published by Routledge. Paperback: £18.99, $29.95
978-0-415-69417-9; Master eBook ISBN10 : 0203071867. Master eBook ISBN13 : 978-0-203-07186-1. To order copies go to: http://www.routledge.com/books/details/9780415694179/

For more information about the ideas behind the book: www.crisisofglobalsustainability.com

Ian Dunlop's presentation on same issues as he spoke at the UN can be seen here:http://vimeo.com/53540204