Carbon dioxide levels highest in 650,000 years

climateprogress.org — World carbon dioxide levels jump 2.3 ppm in 2008 to highest in 650,000 ? if not 20 million ? yearsNOAA?s Global Monitoring Division reports that global concentrations of the primary heat-trapping greenhouse gas, carbon dioxide, jumped 2.28 ppm in 2008. Feb 13, 2009 View in Crawl 4