There seems to be a lot of debate about whether, and how, plastic degrades in a landfill.
There are many different types of plastic, from polypropylene to polystyrene. With this variety, it seems possible that each polymer could have a different behaviour.
At any rate, some argue that plastic degrades after several decades, others after hundreds of years, and others still after thousands of years. Whereas, others argue that plastic does not degrade at all.
Then there's the argument of "biodegrading" vs "degrading". While plastic may "break down" in a landfill, does it every completely erode? Or, does it merely break down into micro-plastic and remain in the earth forever?
In short: does plastic degrade entirely in a landfill? If so, how does this process work? If not, why?