Enviroment/Climate
For the last six hundred thousand years, the level of CO2 in the atmosphere has fluctuated between 180 and 280ppm. It is now over 380ppm.
To take atmospheric CO2 from current levels back down to 330ppm would apparently require us to remove somewhere around 100 billion tons of carbon from the atmosphere, while going to 280ppm would require removing about 200 billion tons of carbon. As impossible as this appears to us now, if we could get to a carbon neutral energy economy and then remove 5 or 10 Gtons per year of net carbon from the atmosphere, the optimal CO2 level might actually be achieved in a period of several decades.
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