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They have a nice graph on this page describing the problematic nature of that comment:

EG the land area + fresh water cost to support a similar revmoval of C02 through forestation is an untenable strategy

I don't know man, the world is a big place and growing trees parallelizes nicely.

Cut them down and make buildings out of them, land area problem solved. The fresh water cost I don't buy, there's rain man, it's free.