Comment by riobard

This is the way to go.

China cracked the pollution issues of burning trash, and built a lot of high-temperature incinerator to burn trash and generate electricity.

The overcapacity leads to a shortage(!) of new trash to burn, and it has started to dig out landfills accumulated from the past decades.

The video from Asianometry is very interesting: https://www.youtube.com/watch?v=AuIEBSb2xiE