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I don't think anything would change quickly enough for us to realize it.
In the grand scheme of things, humanity's like a parasite... we're here and dominant. Too smart for our own good, really. We keep figuring out how not to die... meanwhile we're multiplying like crazy.
Something's gotta give. Either, eventually, we move to other planets... or we **** up our home to the point that it kills us off. If we did find some way to "save the enviroment" or survive the natural cycles (ice ages, etc), eventually... there'd just flat out be too many of us.
In any case... the "world" and life will be here... long after we're gone.
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