[Someone]

In a world where energy is free, I don’t see polluting industry as a problem. What pollution is there that can’t be prevented if you can spend as much energy as you want in recycling stuff? If you try hard enough, about everything can be taken apart into its chemical elements.

The problem would be the demand for resources. Yes, there’s the asteroid belt, but it is far away. Would we get there before we would have dug up the earth? Maybe.