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

Absolutely, but green activists are actively fighting against burning trash. This needs to stop. Even if a country doesn't burn coal it should still burn trash instead of sending it to poor countries. People need to take responsibility for the trash that they generate.

Yeah, burning trash isn't a great answer

I'd say it depends. Amager Bakke in Denmark is a combined heat and power plant that burns waste and emits 687 grams of CO2 per kWh vs natural gas at 290 to 930 grams per kwh and coal at 900 to 1,050 grams per kwh. This makes burning trash CO2 competitive with Natural Gas. Using it for district heating probably improves the picture here because resistive electrical heating on a standard grid emits more CO2 than natural gas heat or pumped district heating.

It plausible that in cold climates burning trash has significant advantages.

90% of countries use some kind of fossil fuel to generate electricity or heat, so burning trash instead won't increase the CO2 emissions. The rule is simple: if you already burn fossil fuels, you should burn trash instead.