Some people say we should send people to Mars because we need to learn how to survive on other planets. One day Earth will be uninhabitable and we’ll have to go somewhere else. Even if Earth becomes uninhabitable I doubt it could be much worse than Mars. The atmospheric pressure is a tiny fraction of Earth’s. If there is any liquid water we haven’t found it yet. The atmosphere contains almost no oxygen. And the temperatures are far colder than Antarctica. So I think, if we go to Mars it should be for the pure joy of exploration.