It'd be inefficient anyway to use Earth resources except for some early bootstrapping. Extraterrestrial resources (asteroids, the moon, solar power, local resou

It'd be inefficient anyway to use Earth resources except for some early bootstrapping. Extraterrestrial resources (asteroids, the moon, solar power, local resources on Mars) are more accessible. And it's underappreciated that for what you do need from Earth, launch can get much cheaper/cleaner after enough development in space, just as an elevator system gets more efficient with a counterweight.