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The wrong kind of history
This one speaks for itself. The Scripps Institute of Oceanography maintains a daily record of atmospheric carbon dioxide:
Concentrations of the greenhouse gas carbon dioxide in the global atmosphere are approaching 400 parts per million (ppm) for the first time in human history
And the Sydney Morning Herald reports:
Carbon dioxide concentrations in the Earth's atmosphere are on the cusp of reaching 400 parts per million for the first time in 3 million years.

The daily CO2 level, measured at the Mauna Loa Observatory in Hawaii, was 399.72 parts per million last Thursday, and a few hourly readings had risen to more than 400 parts per million.

''I wish it weren't true but it looks like the world is going to blow through the 400 ppm level without losing a beat,'' said Ralph Keeling, a geologist with the Scripps Institution of Oceanography in the US, which operates the Hawaiian observatory.

Blowing through levels not seen in three million years, and not looking back.

Originally posted to Laurence Lewis on Mon Apr 29, 2013 at 04:06 PM PDT.

Also republished by Climate Change SOS, Science Matters, DK GreenRoots, and Daily Kos.

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