Thousands of protesters produced enough garbage to fill an estimated 250 trucks with trash. [...]
The Army Corps closed the area and said in a press release that grass has been destroyed or removed from some 50 acres.
There’s more in that link above.
And note, for the stupid, it’s not that the protesters don’t have a point about possible environmental issues with pipelines, it’s that people supposedly so concerned about environmental damage reveal themselves to not be particularly concerned about environmental damage either. And expect others to clean their damage up for them. At no cost to themselves. In the aftermath of a pipeline accident, the corporation involved will have clean-up costs and fines.