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  5. A level of no more than 350 ppm is still feasible, with the ...

A level of no more than 350 ppm is still feasible, with the help of reforestation and improved agricultural practices, but just barely - time is running out.

James Hansen
Running, Practice, Levels
A level of no more than 350 ppm is still feasible, with the help of reforestation and improved agricultural practices, but just barely - time is running out.