Back in 2010 the City of Detroit could no longer afford to maintain their parks. But one man thought, "I could help with that." So now every other week he and some others get out and mow a bunch of the sports fields. They call themselves the Detroit Mower Gang.
It's a common story. For one reason or another some public lands are unmaintained or abused. So some member of the public steps up and says, "Hey, this is our land. We can take care of it." And then they do. What groups do that sort of thing in your backyard?