I did see something about new methods through chemical processes to turn more plastics back into the feedstock. Search “plastic feedstock” or “circular feedstock” or something. It probably requires some chemicals and heat and pressure or something, but that could be powered by solar or wind. It’s just a question of economics (money), investments, and most likely planning.

But really, burning plastic isn’t “nice” but fundamentally there isn’t a big difference between some mineral rock buried below the earth or plastic. And with carbon sequestration it’s a net positive - at least once we stop using fossil fuels and switch to a circular economy.