Never. We will eventually send our species to reproduce to other habital planets.
At least a billion years
millions of years
1000 years give or take
Several hundred years
less than a 100 years
in a few decades
December, 21 2012
Never going extinct is not an option. Everything does.
At the rate we're going, there's a very decent chance it will be sooner rather than later.
Still, our technology - bound to kill our species - might make some survive for a few hundred years to come.
Pretty sure we'll do irreparable damage to the planet before we develop the technology needed to terraform/travel to other habitable planets. I give us around 100 years, probably a lot less at the rate we are going.
We will end when I say we do.
90 Draenei Shaman -- Praey / Burning Legion
90 Human Death Knight -- Thaiyn / Burning Legion