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We could go down a lot, and let them come up a bit higher, so that the change would be still climate positive.

Or have I misunderstood your comment?

We don't have the ability to go down alot without killing alot of people, and if they come up it will not be possible to limit it because game theory

Sure we have.

Use less fossil fuels != kill a lot of people :) Not in the western countries, which waste them left and right.