lol. the earth will most likely outlast any human population. even with a nuclear strike that took out the whole human population the earth would still remain in tact. there would have to be something of epic proportions to completely destroy the earth.
the earth wont die, but we will eventually im sure.
In the words of George Carlin, "There is nothing wrong with the planet... the planet is fine, the people are ****** ... the planet isn't going anywhere, WE are!"
The Universe will eventually grow cold and dark. Everything will die. Might as well go out and rob a couple of banks and kill a couple of prostitutes. No point to anything anyway.