Bacteria which Breakdown Plastics have been discovered.

The world have the general problem that plastics are non-biodegradable meaning they cannot be broken down by our bacteria which makes other substances to decay (Biodegradable) quickly.

But here is the good news a new Bacteria which breaks down a type of plastic known as PET,
commonly used in water bottles have been found.
Japanese scientists discovered Ideonella sakaiensis can fully
degrade PET plastic
Almost a third of all plastic packaging ends up in nature or
clogging up infrastructure,a finding that might help solve
the world's fast-growing plastic pollution problem.
The species fully breaks down one of the most common
kinds of plastic called Polyethylene terephthalate (PET). It's
the type often used to package bottled drinks, cosmetics
and household cleaners.
Styrofoam-eating mealworms might help reduce plastic
waste, study finds
The findings, published in the academic journal 'Science ' on
Friday, say that "Ideonella sakaiensis breaks down the plastic
by using two enzymes to hydrolyze PET and a primary
reaction intermediate, eventually yielding basic building
blocks for growth."
This could be really good news for the environment. Almost
a third of all plastic packaging escapes collection systems
and ends up in nature or clogging up infrastructure, the
World Economic Forum (WEF) warned.