Looks like nature is on top of the plastics problem already.
This bacteria only eats PET plastic, which is 1of 7 plastics made polluting the the planet.
It's not much of a stretch to think other bacterias will show up for the other 6 eventually.
". . .in 2016 Japanese scientists made a remarkable discovery that could help tackle the world's plastic problem, according to the journal Science. Scientists collected plastic bottles outside a recycling facility, and discovered that a species of bacteria was "eating" its way through them. Normally, bacteria spend their time absorbing dead organic matter, but Ideonella sakaiensis has developed a taste for a certain type of plastic called polyethylene terephthalate (PET)."