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Past the tipping point?

May 22, 2013
Williamsport Sun-Gazette

Pollutants like carbon dioxide trap heat in our atmosphere and keep it from entering space. They cause increases in temperature that are destroying our planet before our very eyes. For the first time in human history, this past year, the daily average of carbon dioxide in the atmosphere surpassed the dangerous threshold of 400 parts per million as measured on top of the Mauna Lao in Hawaii. The last time that happened was 3 to 5 million years ago when human beings did not exist.



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