Yes they exist and they work. However to build them requires stringent regulations to make them a viable cost solution.
If it is ok to blow out the toxic smoke the high end solution will not be built.
The best thing is still avoiding waste.
> However to build them requires stringent regulations to make them a viable cost solution
In the US, the EPA has had regulations around this since the late 70's; it's a cost of doing business at this point, not a wild new theoretical rule framework.
