While pollution affects the oceans, its effects extend to freshwater as well. I saw this firsthand as I cleaned up my neighborhood block.
My neighborhood block consists of private property but also two public properties, each featuring a freshwater pond. There was a noticeably larger amount of pollution found in the ponds over public properties, a scenario known as the tragedy of the commons.
Pollution ranged from plastic to styrofoam to glass. The complete results are shown below in this photograph.