Mark Pagani : « He says research on the past shows the dangers of high levels of greenhouse gases . Today 's CO2 levels comparable to time when Greenland had little ice , sea was 65 feet higher . Climate , one must note , is not weather . Pagani : With more CO2 , we hark back to when crocodiles and sub-tropical plants inhabited the poles .
Mark Pagani : « He says research on the past shows the dangers of high levels of greenhouse gases . Today 's CO2 levels comparable to time when Greenland had little ice , sea was 65 feet higher . Pagani : With more CO2 , we hark back to when crocodiles and sub-tropical plants inhabited the poles .