Exit plan?
Hopefully we'll develop a system to detect (and somehow deal with) anything threatening to collide with Earth.
But the human race still needs an exit plan. We might figure out, someday, a practical way to defend ourselves against massive flying rocks, but what about things like supervolcanos and climates that vary from snowball earths to boiling Cretaceous periods? Planets are just too dangerous to live on. Our future, if we have one, will be in space habitats. Otherwise, someday there will be another real disaster like the Permian-Triassic mass extinction, and the human race will be just another layer of interesting fossils for some future life form to dig up.
Biting the hand that feeds IT
