Sure heavy industry in space wouldn't pollute the Earth, but the physics for this just don't work out. How would you get all the produced goods back to Earth?

Sure heavy industry in space wouldn't pollute the Earth, but the physics for this just don't work out. How would you get all the produced goods back to Earth? Lots and lots of rockets that would then have to fly back up to space. The energy involved with that would be massive and cost prohibitive on the scale that it would need to be in order to replace any meaningful amount of heavy industry on Earth. A space elevator could potentially be much better, but none of these private companies are pursuing space elevators. Investing money into developing renewable energy power for heavy industry makes infinitely more sense, but isn't as cool as launching rockets. IIRC the Gates Foundation is investing in a solar powered method for smelting steel.