Plasma gasification. It is fine we have decided we can only do so much to reduce the waste stream, that which remains can be fed into a system to render it inert and the syngas produced burned for energy in a responsible manner.

https://news.ycombinator.com/item?id=38994374

https://news.ycombinator.com/item?id=38722984

("This is NOT the same as incineration. Plasma gasification does not produce toxic gases vented to atmo, etc. The main byproducts are "syngas", which is mainly H2 and CO and can be reused to power the facility, and slag.")