The Dumbest Climate Conversation of All Time - 0 views
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he historic level of co2, for all of human civilization prior to the Industrial Revolution, was about 275 parts per million. It’s now at about 420 parts per million, an increase of fifty percent. Scientists think that anything above 350 parts per million is intensely dangerous.
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Here’s how Jim Hansen and his colleagues put it in 2008:
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If humanity wishes to preserve a planet similar to that on which civilization developed and to which life on Earth is adapted, paleoclimate evidence and ongoing climate change suggest that CO2 will need to be reduced from its current 385 ppm to at most 350 ppm.
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