As I understand it something like 99% of all species have become extinct. Not that we should want to hasten the demise of Polar Bears or Humans for that matter but sometimes I think we believe we are so special that we can actually control the big cycles. Our contribution to global conditions is probably miniscule in the long term.
There seems to be no end to the extinction causing changes our planet has and will continue to go through. Years from now a visitor to our planet would probably not know that humans ever existed. It seems to be the natural order of things. Unless of course we can survive long enough to advance technology and populate the cosmos.
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