[ We’re doomed!
Yes, eventually we are. It may be a sunstorm, a supervolcano, an asteroid or comet strike, a ferocious pandemic, climate change (yes, catastrophic change happens, but not for the reasons the Gorebots say) or something presently unpredictable. Eventually the human race will either be destroyed or reduced to a small remnant. Such catastrophes have happened in the past and will happen again given the passage of time. ]
Strip mine the earth and use those resources to colonize space, it is the only way to ensure our survival and the survival of every remaining species on earth.
Because in 1+ billion years all life on earth will be dead anyways....
As I always say, the meek shall inherit the Earth -- but not the mineral rights!