Environmental Research Web: During the last ice age, roughly 20-100,000 years ago, there were a number of abrupt changes in climate. Now researchers from Oregon State University have found out more about the role of carbon dioxide in these transitions. “The most interesting findings are firstly that atmospheric carbon dioxide is strongly correlated with Antarctic temperature and secondly that it begins to increase a few thousand years prior to large abrupt warming events in Greenland,” researcher Jinho Ahn told …