> Compostable will produce methane etc., especially in your back yard.

Is that a bad thing for a small garden compost pile? I understand it's dangerous on a large industrial scale.

Methane is around 100X worse as a greenhouse gas than CO2. So even a little, is a lot.

As long as we are burning fossil fuel for low-intensity heat use anyways, (e.g. combined cycle heat/power plants), giving the fuel a temporary role as packaging before burning doesn't seem such a bad idea. Emissions treatment has come a long way. Alternative packaging solutions don't have zero footprint either (e.g. ferrying around reusable containers)

Burning the stuff is only profitable if you get it sorted without contaminants. But only a fraction of packaging is collected properly.

As long as that crap is produced, people will throw it wherever they want, and nobody will collect and sort the plastic for free just so you can burn it "profitable".