Humanity (eventually) learned that it can't just burn all its rubbish. Because burning is the worst thing you can do with hazardous biochemicals. You're energetically giving them a carton of cigarettes and airfare, helping them into the sky to spread their unpleasant poison around the world. But the problem isn't burning them -- it's not burning them hard or smart enough.
Pyrogenesis Canada Ltd
Advancing so fast we're burning past fire
Most waste materials are made of the same atoms as everything else; the only problem is their structure. Plasma gasification utterly destroys that structure. Even the most awful poisons are helpless when you rupture every one of their atomic bonds. Which is why plasma gasification is working on destroying chemical weapons. Forget smashing things into last week -- we're smashing them all the way back to early universe, throwing them through the periodic table to shatter them down to component elements, as physics finally wins that wrestling match against chemistry. By controlling how it cools, we can convert the waste into flammable syngas fuel and an inert slag which can be used as a building material.
To replace the one we smashed, have a 3D periodic table