Photos from US spy satellites declassified by the Obama White House provide the first graphic images of how the polar ice sheets are retreating in the summer. The effects on the world's weather, environments and wildlife could be devastating

Satellite images of polar ice sheets taken in July 2006 and July 2007 showing the retreating ice during the summer. [View larger image]

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For years as the planet warms the arctic icecap has been melting and retreating.

Many of us have long known that arctic wildlife like polar bears, gray whales, killer whales, narwhals, seals, and arctic fish and bird populations, as well as arctic coastal human settlements, are in danger of eventual extinction as their natural habitat has been retreating, but what most of us haven't known is the extent and speed of the retreat.

Because of recent ice loss, Arctic surface air temperatures are warmer than normal, and much warmer than scientists expected to find.

As the ice has been melting the growing spans of open water absorb more sunlight than the ice previously did, so as more open water becomes uncovered, the remaining ice will melt more quickly. This will itself accelerate the rate of warming and lead to more ice loss. In addition, global climate change is likely to drive warmer ocean currents into the Arctic region.

You get the picture. What has developed is a positive feedback loop with dramatic implications for the entire Arctic, and for the rest of the planet, and for all life on Earth. It's been nice knowing you.

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