I think the motivation behind compostable plastic is to reduce the amount of micro plastics ending up in the environment rather than CO2 emissions. That said,

I think the motivation behind compostable plastic is to reduce the amount of micro plastics ending up in the environment rather than CO2 emissions. That said, burning non-compostable plastic (with appropriate emissions control) does seem like an appropriate way of disposing of it, and generating some energy in the process.