Musk's other theory for making Mars warm enough to be habitable is using nuclear bombs on the poles of the planet. The thermal radiation could be harnessed as heat, Musk posited.
It's a wild idea, and probably not the favorite option for the private Mars One project. Mars One plans on having a human settlement - in contained pods - in 2027.
If you haven't seen Musk's segment with Colbert, check it out below. And let us know what you think about Musk's plans in the comments below.