Study: Arctic Warming at Twice the Global Rate

OSLO, Norway (Reuters) -- Global warming is heating the Arctic almost twice as fast as the rest of the planet in a thaw that threatens millions of livelihoods and could wipe out polar bears by 2100, an eight-nation report said on Monday.

The biggest survey to date of the Arctic climate, by 250 scientists, said the accelerating melt could be a foretaste of wider disruptions from a build-up of human emissions of heat-trapping gases in Earth's atmosphere.

The "Arctic climate is now warming rapidly and much larger changes are projected," according to the Arctic Climate Impact Assessment (ACIA), funded by the United States, Canada, Russia, Denmark, Iceland, Sweden, Norway and Finland.

Arctic temperatures are rising at almost twice the global average and could leap 4-7 Celsius (7-13 Fahrenheit) by 2100, roughly twice the global average projected by U.N. reports. Siberia and Alaska have already warmed by 2-3 C since the 1950s.

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