Scientists who keep tabs on our atmosphere report that the level of carbon dioxide is higher now than it's been since long before humans evolved. Senior writer for Time Magazine Jeffrey Kluger joins ... more 
Scientists who keep tabs on our atmosphere report that the level of carbon dioxide is higher now than it's been since long before humans evolved. Senior writer for Time Magazine Jeffrey Kluger joins "CBS This Morning: Saturday" co-hosts to talk about how this is affecting planet earth. less 
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Sun, May 12, 2013 7:50 AM EDT