You might like to read about https://en.wikipedia.org/wiki/Incineration https://en.wikipedia.org/wiki/Incineration and https://en.wikipedia.org/wiki/Waste-to-en

You might like to read about https://en.wikipedia.org/wiki/Incineration https://en.wikipedia.org/wiki/Incineration and https://en.wikipedia.org/wiki/Waste-to-energy_plant https://en.wikipedia.org/wiki/Waste-to-energy_plant It's a fascinating topic. There's even more problems than the ones you bring up, but engineers are also pretty smart.