Exodus: Elon Musk argues that we must put a million people on Mars if we are to ensure that humanity has a future

‘Fuck Earth!’ Elon Musk said to me, laughing. ‘Who cares about Earth?’ We were sitting in his cubicle, in the front corner of a large open-plan office at SpaceX headquarters in Los Angeles. It was a sunny afternoon, a Thursday, one of three designated weekdays Musk spends at SpaceX. Musk was laughing because he was joking: he cares a great deal about Earth. When he is not here at SpaceX, he is running an electric car company. But this is his manner. On television Musk can seem solemn, but in person he tells jokes. He giggles. He says things that surprise you.