Ok, then this is about enzymes which do not yet exist in the organism. You could then modify bacteria so they produce this enzyme and feed on plastic, I see.
But producing fuel as the fellow suggested would then be another function to be added to the bacterium; and maybe it should work on different kinds of plastic.
Of course, that's why I focused on degradation. There's plenty of room for improvement. For instance, PETase is not very efficient actually, and many research groups are working on its engineering.
