Wednesday, June 06, 2012

400 ppm

Thank Lynelle for the heads-up on this one
"The concentration of carbon dioxide in the atmosphere of Barrow, Alaska, reached 400 parts per million (ppm) this spring, according to NOAA measurements, the first time a monthly average measurement for the greenhouse gas attained the 400 ppm mark in a remote location."
http://researchmatters.noaa.gov/news/Pages/arcticCO2.aspx

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