Er, have you checked out the time it takes just to get to Mars?You people are dumb.
Necessity is one of biggest contributor to innovation.
By the time earths resources are dried up.
We will be forced to look for alternative resources.
There's infinite amount of planets and solar systems.
We will just find a new way.
The total journey time from Earth to Mars takes between 150-300 days depending on the speed of the launch, the alignment of Earth and Mars, and the length of the journey the spacecraft takes to reach its target
Read more: http://www.universetoday.com/14841/how-long-d...
It grows exponentially after that.