This page has a graph that shows how global temperature changes are part of cycle that has existed longer than humanity. http://earthobservatory.nasa.gov/Featu

This page has a graph that shows how global temperature changes are part of cycle that has existed longer than humanity. http://earthobservatory.nasa.gov/Features/GlobalWarming/page3.php http://earthobservatory.nasa.gov/Features/GlobalWarming/page...