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Submitted by Caterina Lindman on

My understanding is that there has been global warming - one could make the argument that there hasn't been much change in global warming over land over the last 17 years, but the last 17 years have been significantly warmer than the period from 1850 to 1997.

While I agree that plants need carbon dioxide to live, wht makes carbon dioxide a pollutant is the increased concentrations of carbon dioxide in the atmosphere. The concentration was 279 parts per million (ppm) in pre-industrial times, and it has now reached 400 ppm. James Hansen's studies indicate that we should be aiming for 350 ppm in order to preserve a safe climate for humanity and all other life on earth.

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