AP Photo/John McConnico |

The Big Melt
Icebergs float in a bay off Ammassalik Island, Greenland, in this July, 2007 file picture. A record amount of Greenland's ice sheet melted this summer in an ominous new sign of global warming. Part of the reason for the big melt, researchers believe, was thinner ice becomes more vulnerable to feedback cycles caused by increased sunshine.

« back to article