Read here. Contrary to the IPCC global warming alarmist scientists' claims, multiple historical and ancient periods were significantly warmer than current temperatures that the Copenhagen COP15 climate change conference is obsessed with. These warmer periods occurred during low levels of atmospheric CO2 and the historical global 'warmings' did not cause any of the catastrophic calamities that the United Nations (UN) predicts for modern times. (click on image to enlarge)