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World's Atmospheric Carbon Dioxide Passes 400 PPM Threshold. Permanently

Carbon dioxide just hit its annual minimum at Mauna Loa Observatory and failed to dip below 400 ppm.
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Here’s another excellent repost from Shrink That Footprint: By Lindsay Wilson The world reached a grim milestone recently, with atmospheric concentrations at the historic Mauna Loa observatory hitting the 400 parts per million mark ...


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