Because then another question arises: what breaks down the fungus?
Edit:
This question is serious. If this fungus would eat all that plastic, this would introduce a huge amount of new life in the ocean with unknown effects to the ecosystem. We would replace one problem with another.
Edit:
This question is serious. If this fungus would eat all that plastic, this would introduce a huge amount of new life in the ocean with unknown effects to the ecosystem. We would replace one problem with another.