My article on current new level of 400ppm of CO2:
Green alert: World reaches sad milestone
Hindustan Times (Lucknow)
May 16 2013
On May 9, 2013, atmospheric carbon dioxide concentration hit the level of 400 parts per million (ppm). This new level is 50 ppm higher than the ‘safer’ level of 350 ppm. This new number means that there are 400 molecules of carbon dioxide in the air...read more...
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