Better keep Mothership Earth habitable. It will also cost trillions less. Musk is a moron for deceiving people who have no idea of what it takes to go to Mars, that a manned trip to Mars will happen within a decade or so. Unless we come up with some fundamentally different answers and solutions to problems (duration, gravitation, radiation, food supply, to name a few), a trip to Mars will not happen this century. Nor should we strive for one, given the enormous expenses attached to this.