Landfills used to be nature until they got turned into landfills.

The floating plastic island in the Pacific has actually been a huge boon to the fishery. This island floats in an area that is otherwise devoid of life. There is very little life in the open deep ocean. But the plastic island provides structure and is a huge nursery for hundreds, maybe thousands, of species in the same way throwing your Christmas tree out on the lake ice provides structure for next years spawn.