Natural processes tend to be circular. The byproduct or waste of one organism becomes the fuel or food for another. Everything produced by one process gets consumed by another.
Artificial processes tend to be linear. Waste plastic and hydrocarbons have no natural consumers. Recycling is an attempt to close the loop and reuse the waste materials we produce, but it takes a lot of effort and attention, something that tends to diminish compliance.
To live in a truly sustainable way, we need to find ways to make our processes circular without requiring a lot of effort.