Nothing can last forever, not even us humans. In fact, everyday humans seem to be shortening their lifespan instead of lengthening it. The way we treat the planet is the quick way to extinction. Many people seem not to be worried though because they believe God will save them. The question is... why would God save people who destroyed what he/she made?
The human race is growing at an exponential rate and will exceed the Earth's carrying capacity (the maximum number of people the world can physically support) within 150 years. When this point gets near, people will begin to likely fight over limited resources (water and food being paramount) and will likely start world-wide war.
There have been several mass extinction events in the history of planet earth and it is pretty much inevitable that humanity will go extinct, and most likely by our own doing. The most likely cause of our downfall will be our hand in climate change and will make our civilization unsustainable.
Since we are slowly destroying our atmosphere, we will slowly destroy the human race. Also, eventually the sun like every star, will grow until a certain age where it will be so huge that it explodes. When that happens, it will mark the end of the human existence for sure.
I don't know when humans will go extinct, but it is an inevitability. It is going to happen eventually. And if we don't either reverse global warming or move off of this planet, it will be sooner or later. Also, just for the fun of it, one day the universe will die a heat death and everything will be dead.
The time that we die we can't stop it. Time is going to tell us when we die like the bees die out out and humans will die after them. I think that we are not going to die if mother naught say so or earth will tell us that time.
I think we will die out but then evolve from chimps again! So I think it is one big life cycle that in order to complete we have to die and then be evolved again! But by the time the sun explodes and takes earth with it we will have the skills and the knowledge to got and live in different planets!!