No one has more legal power to halt the reckless expansion of the tar sands than the First Nations living downstream whose treaty-protected hunting, fishing, and trapping grounds have already been fouled, just as no one has more legal power to halt the rush to drill under the Arctic’s melting ice than Inuit, Sami, and other northern Indigenous tribes whose livelihoods would be jeopardized by an offshore oil spill. Whether they are able to exercise those rights is another matter.