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CO2 passes symbolic mark of 400 ppm
Posted By -NO AUTHOR- On 05/10/2013 @ 11:48 pm In World | No Comments
(BBC News) Carbon dioxide levels in the atmosphere have broken through a symbolic mark.
Daily measurements of CO2 at a US government agency lab on Hawaii have topped 400 parts per million for the first time.
The station, which sits on the Mauna Loa volcano, feeds its numbers into a continuous record of the concentration of the gas stretching back to 1958.
The last time CO2 was regularly above 400ppm was three to five million years ago – before modern humans existed.
Scientists say the climate back then was also considerably warmer than it is today.
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