The concentration of carbon dioxide in the Earth's atmosphere is about to rise above the 400 parts per million threshold for the first time in human history.
The milestone is not to be regarded as any kind of scientific "tipping point" for climate change, but it is an important psychological barrier -- at no time in the history of human civilisation has there been such a high concentration of carbon dioxide in the Earth's atmosphere.
By: Ian Steadman, Edited by: Olivia Solon
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via Wired.co.uk
http://www.wired.co.uk/news/archive/2013-04/30/carbon-dioxide-400ppm
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