http://www.ncdc.noaa.gov/oa/climate/research/cag3/na.html But Jeff, you should know by now, that Drastical Global Warming Caused by Anthropogenic CO2-Emissions Might Cause Lower Average Temperatures at some Locations. Western Civilization must stop emitting any CO2, better they'd stopped breathing at all. And just to make sure, nuke all coal/oil/NG powerplants in China and India, as they won't stop producing smoke otherwise. The following nucular winter should be able to compensate for about 50% the harmful effect of anthropogenic CO2.