[gowld]

> And if the plastic is then disposed of in landfill then it doubles as carbon sequestration.

Where does plastic come from, if not desequestered carbon? Does it consume CO2 from the air?

[mrob]

It comes from desequestered carbon, but importantly, it's very difficult to re-desequester it. Plastic in landfill is mixed with other waste and uneconomic to recover. It's enforcing "keep it in the ground" (not completely, because the manufacturing and transport release CO2, but better than nothing).