Taken from Mr. Mojo's link at post #63:
Terraforming Mars will be a huge undertaking, if it is ever done at all. Initial stages of terraforming Mars could take several decades or centuries. Terraforming the entire planet into an Earth-like habitat would have to be done over several millennia.
I have seen the future guys, and it ain't pretty. Or comfortable. Or realistic. Rent out Ahnold's Schwarzenegger's 'Total Recall' and you'll see what I mean...
In the meantime, you'll find me on planet earth, prefering to bask in the relative tropical January "habitat" of Earth's Lambeau Field and it's temperature of 10 degrees.