CO2 Highest in 2 Million Years

| Thu Jun. 18, 2009 1:27 PM EDT

Quick hit: an article in the June 19 issue of Science reports that : CO2 in the atmosphere is now at its highest concentration in 2.1 millions years. Also, that more recent ice ages may have been caused by changes in the Earth's tilt toward the sun, not : CO2 levels. So even though carbon dioxide is higher, it doesn't mean it's going to plunge us back into a cooling trend.