It depends why we were green. If it’s because we had cholrophyl in our skin we’d be able to generate engery using carbon dioxide and produce more oxygen.
Camofague in the jungle would be easier too, so we could avoid predators.
by green you mean more earth-friendly (I see a lot of benefits there!), or just painted in green? in the latter case, probably not so many, otherwise many mammals including us would be green already
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