* National Assessment Finds Climate Change “Has Moved Firmly into the Present” The effects of human-induced climate change are being felt in every corner of the United States. . . . If greenhouse gases like carbon dioxide and methane continue to escalate at a rapid...
NASA
Swiftly Melting Planet 2007
The Arctic ice cap normally melts to some extent every summer, but it’s been melting at alarming rates in recent years. The sea ice extends only about half as far as it did 50 years ago, and the Arctic has lost about one-third of its area since satellite measurements began about the mid-1970s.