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I've never been able to figure out quite how I personally feel about the impact we have on the climate/other species. After all, we are a species. If, say, capybaras did all that we've done and eliminated so many other species, in 500 million years someone would look back and say, "Wow, those capybaras sure were the most successful species of all time." And we are the most successful species of all time. The question from a utility standpoint is whether we've hit the backwards-bending portion of our existence, where our very success is what costs us.