> move our most polluting activities (factories, refineries) to the Moon or Mars The delta-v required to move objects between planets is measured in thousands

> move our most polluting activities (factories, refineries) to the Moon or Mars The delta-v required to move objects between planets is measured in thousands of m/s (e.g. just getting to low earth orbit requires about 10000 m/s), and the fuel required goes up exponentially with delta-v. As Elon Musk put it: "If you had crack-cocaine on Mars, in prepackaged pallets, it still wouldn't make sense to transport it back here."