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"A new historical record of carbon dioxide levels suggests current political targets on climate may be "playing with fire", scientists say.

Researchers used ocean sediments to plot CO2 levels back 20 million years.

Levels similar to those now commonly regarded as adequate to tackle climate change were associated with sea levels 25-40m (80-130 ft) higher than today. "

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Photographer James Balog shares new image sequences from the Extreme Ice Survey, a network of time-lapse cameras recording glaciers receding at an alarming rate, some of the most vivid evidence yet of climate change.

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Some scientists suspect that permafrost acts as a cap that protects hydrates from melting, particularly in the shallow Arctic seafloor, where the hydrates are found only a few tens of feet deep. The more that sea or lake waters thaw the permafrost below, the more likely this cap is to blow suddenly, releasing jets of methane up through the water and into the atmosphere.

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An area of an Antarctic ice shelf almost the size of New York City has broken into icebergs this month after the collapse of an ice bridge widely blamed on global warming, a scientist said Tuesday.Humbert told Reuters about 700 sq km (270.3 sq mile) of ice -- bigger than Singapore or Bahrain and almost the size of New York City -- has broken off the Wilkins this month and shattered into a mass of icebergs.

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One of the planet's most fragile and pristine ecosystems sits atop a bounty of untapped fossil fuels.

Melting polar ice is making the Arctic more accessible to shipping and other industry.

The U.S. Geological Survey estimates that 90 billion barrels of oil, 44 billion barrels of natural gas liquids and 1,670 trillion cubic feet of natural gas are recoverable in the frozen region north of the Arctic Circle.

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The ice that has covered the Arctic basin for a million years will be gone in little more than six years because of global warming, a University of Manitoba geoscientist said.

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Chile's glaciers are on the retreat, a sign of global warming but also a threat to fresh water reserves at the southern end of South America, a report has found.
In a November report, the Chilean water utility -- Direccion General de Aguas de Chile (DGA) -- said the Echaurren ice fields, which supply the capital with 70 percent of its water needs, are receding

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Greenland's ice cap, which covers more than 80 percent of the island, is melting faster than expected because of global warming, a Danish researcher said on Monday.
The 1.8-million-square-kilometre (695,000-square-mile) ice cap, which accounts for 10 percent of the planet's fresh water, is losing about 257 cubic kilometres (62 cubic miles) of ice per year.

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A new study shows that the dozens of much smaller outflow glaciers dotting Greenland's coast together account for three times more loss from the island's ice sheet than the amount coming from their huge relatives.

In a study just published in the journal Geophysical Research Letters, scientists at Ohio State University reported that nearly 75 percent of the loss of Greenland ice can be traced back to small coastal glaciers.

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The North Pole has become an island for the first time in human history as climate change has made it possible to circumnavigate the Arctic ice cap.

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Christian Haas of the Alfred Wegener Institute for Polar and Marine Research in Bremerhaven, and his team estimated the thickness of late summer ice at the North Pole in 2001, 2004 and 2007. They found that the ice was on average 1.3 metres thick at the end of the summer in 2007. By contrast, its depth was 2.3 metres in 2001 and 2.6 metres in 2004.

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