Unearthing Cold, Hard Facts About Climate Change in Antarctica - WSJ.com

During Ice Age cycles of cooling and warming, temperatures often rose before levels of carbon dioxide changed—sometimes 800 years or so before—according to previous evidence of ice from Antarctica.

"You don't expect the cause to follow the effect," says atmospheric scientist Richard S. Lindzen at the Massachusetts Institute of Technology, a frequent IPCC critic. "That's become an important issue."