There are some interesting developments to turn plastic back into oil, this one looks to work well:
https://energyindustryreview.com/oil...back-into-oil/
This Canadian Company mentioned in the article looks not be moving to fast, since they have been at it for a decade, and their stock is worth 2 cents.
I've read a few of these over the years, but I never see any reason why they aren't being used more. Seems like a no-brainier, since they generate their own fuel to run, and output useful product.