| 17 June 2010

photo: Dominic Alves via flickr Taking a look back to past global climate changes, researchers led by Timothy Herbert of Brown University have determined that for at least the past 2.7 million years tropical temperatures have "changed in lockstep" with the cyclical spread and retreat of ice sheets, and that CO2 has been the main factor dictating global climate patterns. ... Read the full story on TreeHugger