[ItsDeathball]

As much as I like the idea of space-based industry, it's likely that the level of self-contained precision required in a vacuum would also render Earth-based industry entirely non-polluting, though probably unprofitable as well.

The argument for space-based industry has to start with economics, where it's cheaper because it's closer to the raw materials (asteroids) or closer to the consumers (Mars, lunar, and orbital habitats). The elimination of dirty industry from Earth would only come about as a far-downstream side effect of a well-developed space economy that makes it cheaper for Amazon to drop a Kindle on your house from orbit that it would be to manufacture it in China.