I have been watching magnet fishing and people love to toss stuff over bridges without a second thought on the environmental impact. Hiding evidence I can almost understand but not lawnmowers, car batteries, etc.
It seems deeper fines should be made to discourage this terrible behavior.
Junk also tend to accumulate in rivers and lakes. Once it’s in there it’s out of sight, out of mind - and even if you know it’s there it is often difficult to remove.
When it finally gets cleaned up by bringing in the magnet or a barge to dredge it up or whatever, you’re seeing years if not decades of stuff that’s getting pulled out all at once.