Sometimes I wonder - I, or perhaps humanity as a whole, we have so much anxiety about the destruction and depletion of our natural resources, the extinction of species, the CO2 in the atmosphere, the conservation of our environment. Some of us try so hard to be environmentally conscious by recycling waste, reusing appliances, conserving water and energy.
Then maybe 100 years from now the killer asteroid will struck Earth and obliterate everything, or the supervolcano under Yosemite will blow up. And the universe will point the finger at us and say "ha ha!"
That would be a real bummer.
But I suppose this is like saying, why take care of myself? Why take a shower in the morning, have a balanced died, quit smoking, if maybe tomorrow I'll be dead?
As long as we have a chance at survival, we have to protect our heritage, which means the natural environment that spawned and hosts us.
Who knows, maybe in 100 years, instead of being obliterated, we will take this heritage with us to the stars.