Did you know that the Earth has, perhaps, as little 5,000,000 years left to live (EDIT: My mistake; the current hypothesis suggest about 1 billion or so years left)? Perhaps that seems like a long time, but if you consider that she's been inhabited for some 4.5 billion years, this news might strike you as comparable to a senior citizen being told that their heart will stop beating in a year's time (it does to me, anyway).
5,000,000,000 years is a lot of human generations, but the vault we borrow from is never bottomless, and someone at some point had best be able to say, "We're not taking another step back. We just don't have the time."
My thoughts are that it may as well be us.
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