The amount of the gas in the air has not been this high for at least three million years, and scientists believe the rise portends large changes in the climate and sea level. Taken from: Carbon Dioxide Level Passes Long-Feared Milestone ; ;Related ArticlesDot Earth Blog: Fresh Analysis of the Pace of Warming and Sea-Level RiseDot Earth Blog: Bend, Stretch, Reach, Teach, Reveal, Reflect, Rejoice, RepeatScientist at Work Blog: Rummaging Among Skins and Skulls ;
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