When Elon Musk founded SpaceX in 2002, he envisioned a greenhouse on Mars, not unlike the one later depicted in the 2015 blockbuster The Martian. Soon, his fantasy grew from a small-scale botanical experiment into a vision for a self-sustaining Martian city. In a speech at the 67th International Astronautical Congress in 2016, he argued his point. “History is going to bifurcate along two directions. One path is we stay on earth forever and then there will be some eventual extinction event,” Musk says. “The alternative is to become a space faring civilization and a multi-planet species, which, I hope you would agree, is the right way to go.”
Though Musk later clarified that the extinction event he referenced may take place millennia (or even eons) in the future, the conditions on earth today are becoming increasingly dangerous for human beings. Deadly heat waves, food insecurity and catastrophic natural disasters ...
