Replying to Avatar a source familiar with the matter

You're considering costs and not benefits

Warmer temperatures would free up vast tracts of land for cultivation in Russia and Canada, as well as reduce weather-related death, as well as enhance plant productivity via greater rain & CO2
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kakukaku 2y ago

Pretty sure more ≠ better with plants. More C02 and water likely isn't better for plants, just like water and oxygen being good for humans, but excess of either is detrimental.

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a source familiar with the matter 2y ago

No, infinite CO2 would not be good

But current atmosphere is 400ish parts per million ie 0.04%

Greenhouses pump in CO2 to 3x that or more - because it's good for the plants