Melting the facts about Greenland’s ice sheet
Humans now control Earth's climate, James Hansen of NASA told CBS' "60 Minutes" recently. His evidence: the edges of the Greenland ice sheet are melting rapidly. Hansen says the speed of this melting proves that man-made greenhouse gases are responsible. Sorry, Dr. Hansen, but the melting edges of the Greenland ice sheet don't prove your point. Melting around the edges is exactly what the Vikings saw on Greenland 1000 years ago when they named the island—for its green coastal meadows. They moved in with their cattle, and thrived for 300 years, during what we now call the Medieval Warming. The Vikings' [...]