. . . and even if it were, then how long would it take for something like this to be viable?

Nanotchnology eliminating or reducing some pollution problems.

Emerging Environmental Issues - June 2006

Cleaning up water.

Technology Review: Cleaning Up Water with Nanomagnets

Cleaning up the ozone?


TOWARD REAL ENVIRONMENTAL SUSTAINABILITY BY MOLECULAR NANOTECHNOLOGY

There is a bunch of stuff on the internet about this, but honestly I don't understand how nanotechnology really works . . . or if it even could.