If were going to coloinize mars we need some practice first, aka the moon. Thats NASA's plan try on the moon then move to mars. But first we do need space elevators, they can cut the cost of traviling into space by half. Also to go to mars you would need faster ships. i forget how long it takes to get to mars at its closet range, it might be 6 months but im not sure but that is way to long. And the human body slows down in space and decreases. You lose bone calcium and many other things. It has its challenges but i belive well get it done in MY life time.

Though some of you might not see it.