It's the technical, greenwash term for "we're gonna burn it to release some heat". It helps environmentalists to avoid saying directly that they've failed, and the only option for recycling and disposal is to burn it.
The world of being 'eco-friendly' is full of stupid, illogical, unscientific crap. A few examples:
1. Battery electric cars that rely on vast open-cast lithium mines, extraction and processing of rare-earths that is causing huge toxic and radioactive pollution in China, and cobalt that comes from mines in the DRC employing child labour (same problem with rare-earths applies to wind turbines).
2. Burning huge quantities of heavily polluting bunker oil so that wood pellets from Canada can be shipped across the Atlantic to be burned in British power stations. We might as well just burn the coal under our feet that those power stations were originally designed for!
People have been brainwashed to think that this 'green' stuff is fantastic and that it's helping. Sorry if I've upset anyone, but a lot of stuff that is touted as being green is anything but green