It is a phenomenon that frightens the native people that live around the Arctic. Many fear their children will never know the polar bear. "The ice is moving further and further north," said Charlie Johnson, 64, an Alaskan Nupiak from Nome, in the state's far west. "In the Bering Sea the ice leaves earlier and earlier. On the north slope, the ice is retreating as far as 300 or 400 miles offshore."
Last year, hunters found half a dozen bears that had drowned about 200 miles north of Barrow, on Alaska's northern coast. "It seems they had tried to swim for shore ... A polar bear might be able to swim 100 miles but not 400."
His alarming testimony, given at a conference on global warming and native communities held in the Alaskan capital, Anchorage, last week, is just one story of the many changes happening across the globe. Climate change threatens the survival of thousands of species - a threat unparalleled since the last ice age, which ended some 10,000 years ago.
The vast majority, scientists will warn this week, are migratory animals - sperm whales, polar bears, gazelles, garden birds and turtles - whose survival depends on the intricate web of habitats, food supplies and weather conditions which, for some species, can stretch for 6,500 miles. Every link of that chain is slowly but perceptibly altering.
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