Some countries don’t have the space for landfill and need the energy. If we’re moving towards renewables and less plastic/plastic alternatives then I think this is an acceptable intermediate use of plastic waste.

I'm quite sure that it would be better to burn gas or oil and find some other country to bury the plastic for you. Burning plastic is just very inefficient, and expensive if you don't want the thickest toxic smog.

This. Wait until we get the plastic-eating microorganisms, the plastic certainly isn’t going anywhere.