Warming gas levels hit 'troubling milestone'

Associated Press: The world's air has reached what scientists call a troubling new milestone for carbon dioxide, the main global warming pollutant. Only on msnbc.com AP Updated 84 minutes ago 5/31/2012 9:26:41 PM +00:00 Edwards not guilty on one count; mistrial on others Courtesy Elizabeth Olivas Teen in Mexico due to 'Leap Day' error can return home Updated 80 minutes ago 5/31/2012 9:30:34 PM +00:00 Obama, Scott Walker follow the same script for survival EPA Updated 33 minutes ago 5/31/2012 10:16:54 PM +00:00...

URL: http://www.msnbc.msn.com/id/47637140/ns/us_news-environment/