Mobilizing scientists on climate change

At the recent annual meeting of the American Geophysical Union, scientists presented evidence of climate change proceeding more rapidly than they had imagined 15, 10 or even five years ago. After a brief hiatus due mostly to the economic downturn, they noted, global greenhouse gas emissions are rising again. Arctic sea ice is retreating at an unprecedented rate, sea levels are rising more rapidly than anticipated, and the sea-surface temperatures that drive tropical storms and hurricanes are rising, too.