Elon Musk has the same chance of making humanity multi-planetary as the Pharaohs did. We are still far away from any semblance of a chance to do so.
Besides, anything at all that we can imagine hitting the earth (except a gamma ray burst or collision with another planet) would still leave the earth in a better shape than Mars is. It's entirely doubtful that humanity could be self-sustaining on Mars even in principle, it is certainly not possible with known technologies.
Besides, anything at all that we can imagine hitting the earth (except a gamma ray burst or collision with another planet) would still leave the earth in a better shape than Mars is. It's entirely doubtful that humanity could be self-sustaining on Mars even in principle, it is certainly not possible with known technologies.