North Dakota, feds address garbage left at pipeline protest
Since the protesters claimed to be concerned with the environment and tribal sovereignty, it would seem odd that they turned this portion of tribal lands into a toxic waste dump and then left it to the tribe to pay for its clean-up. It's almost as if they weren't concerned with these things, but wished to hold a layabouts' party dressed up as social action.
Since the Episcopal Church had a role in encouraging them, and with the active participation of clergy and lay leaders, it would seem reasonable that the Church would offer to pay for the environmental restoration. Now, that would be justice.