- 400 PPM: CO2 in the atmosphere now at Prehistoric levels. http://blogs.scientificamerican.com/observations/2013/05/09/400-ppm-carbon-dioxide-in-the-atmosphere-reaches-prehistoric-levels/?wt.mc_id=sa_twitter_mdichristina 82 comments science
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- CO2 Levels for February Eclipsed Prehistoric Highs - Scientific American http://www.scientificamerican.com/article/co2-levels-for-february-eclipsed-prehistoric-highs/ 15 comments
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