Atop A Hawaiian Mountain, A Constant Sniff For Carbon Dioxide

Since 1958, researchers have been measuring the amount of carbon dioxide in the atmosphere at the Mauna Loa Observatory. The remote outpost has just reported a carbon dioxide level of 400 parts per million ? the highest it has climbed in the modern age.

Source: http://www.npr.org/2013/05/13/182654937/atop-a-hawaiian-mountain-a-constant-sniff-for-carbon-dioxide?ft=1&f=1007

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