NASA scientists react to 400 ppm carbon milestone
May 21, 2013
The global concentration of carbon dioxide in the atmosphere – the primary driver of recent climate change – has reached 400 parts per million (ppm) for the first time in recorded history, according to data from the Mauna Loa Observatory in Hawaii.
http://climate.nasa.gov/400ppmquotes/
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Climate Warming Bull Dust, page-120
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