For the past week, concentration of co2 in the atmosphere, measurements from Mauna Loa Observatory in Hawaii, in parts per million (ppm):
December 31 - 399.57 ppmÂ
December 30 - 398.89Â
December 29 - 398.93Â
December 28 - 398.64Â
December 27 - 398.38
Weekly value one year ago, Dec. 31, 2013 — 397.26 ppm
Weekly value 10 years ago — 377.78 ppm
800,000 years ago — 260 ppm
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