Their impression is confirmed by meteorologist Wayne Davidson,who has followed changes in the Arctic ice floe from a base on Ellesmere Island since 1985.
To participants in the AAAS session, devoted to how the Arctic ice loss could affect everything from commerce to weather patterns to national security, the video was a call to action.
But the data from Arctic ice and other sources suggest the atmospheric changes that preceded earlier collapses were dismayingly similar to today's global warming.
According to NASA, the Arctic ice caps have been melting at a rate of 12% per year since as far back as the late 1970s, and even more rapidly since 2007.
Perhaps most critically, climate change caused by our release of CO2 and other greenhouse gases- fueled by our ever-growing population-is melting the Arctic ice cap and increasing the severity of storms and droughts.
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