Man never considered the long term effects of how he mistreated his home, the earth until one day it happened. He abused his planet to the point it could no longer sustain life. Instead of attempting to right the many wrongs he inflicted upon his world he decided to just leave and he did. He settled on Mars in hopes of not having to suffer retributions caused by his recklessness. He finally learned you may be able to run from your problems for awhile, but eventually they will find you.