There is NO oil on Mars.
Goodness. The oil deposits we find today were formed over millions of years. Fossil fuels consist mainly of dead plants -- coal from trees -- and natural gas and oil from algae, a kind of water plant.
There may be - or have been - microbes on Mars, but not plants and algae - hence no oil.
...but seriously...
Yeah we did **** up the planet but it's "normal". By definition we must **** up things to live. We need to convert what we have into the type of energy WE need. The other choice is to cease to exist. I know that some will say that the world would be better without us, but like I said, we either use what we have or we die.
I think that the exploration of space (Mars) is great but as some of you have pointed out, we should explore our own world first. I agree but only to a certain degree. Leaders in the third world have been know to "scrap" loads of foods that arrived in order to keep control on their weak population. If you put aside space till there's no more hunger and wars, we'll never leave more than 10 feet in the air...
Eventually we will need (as a race) to be able to "sail" aways as our ancestors did 100s of years ago. If america, canada, ect... hadn't been discovered (conquered) think of all the things that wouldn't have been discoverd... There are wonders out there that we cannot even fathom. One that comes to mind immediatly - imagine if earth was destroyed by meteors? Mankind might be able to go on with a settlement on Mars or on the Moon. They might even come to our rescue. But aside of sci-fi, the soil on other worlds could eventually be harnassed and actually be a solutions to third world's hunger...