Well, there is many different ways to look at the concept of humans in the future. I for one, think that we will literally destroy the planet Earth, with all of this war and whatnot. We will have advanced technology, yes, but it will all be worthless if all we focus on is getting the most power over the other and almost always at war. When Earth is pretty much destroyed, I know we would probably try to colonize somewhere else. Mars is a very good choice, over the course of time, we could make an atmosphere there and introduce plant life. Of course, this would take a long time, but it would be very possible.
~DragonTrainer:dragonite