World leaders are being challenged to take action on climate change, following the news that CO2 concentrations in the atmosphere have broken through the 400 parts per million barrier.
It's the first time that the symbolic threshold, which was crossed on 10 May at the Mauna Loa observatory in Hawaii, has been passed for three to five million years.
By: Duncan Geere,
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via Wired.co.uk
http://www.wired.co.uk/news/archive/2013-05/11/action-on-co2
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