^ this. the world will not end until our sun's red giant HOWEVER! there Have been many mass extinctions throughout the Earth's age. Dinosaurs, the shit load of extinctions that were before that, and the ice age and stuff. however those all lasted like at least 50x more than out age including the first human beings.there's no rule that makes the world have a mass extinction form some to some million years but, i believe that our time to die, is far far away. plus i think that by the time our sun goes boom we will already have found a good planet to live in.
Also Captain Cook, thats exactly why i added the last sentence. i completely forgot to put up the [/sarcasm] thing