Melanie Fitzpatrick

Melanie Fitzpatrick is a climate scientist with Union of Concerned Scientists

Articles by this author

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Tuesday, May 14, 2013 - 9:04am
400 PPM: We’ve Never Been Here Before
We’ve just crossed a sobering milestone. For the first time since humans have walked the planet, the amount of carbon dioxide in the atmosphere at Mauna Loa Observatory has reached 400 parts per million.
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