There is no disputing that the potential environmental impact of these projects has not been fully assessed but you get the sense from this article that the opposition to them is self-defeating partly due to internal politics (as noted already) and partly to the fact that nobody believes that Indigenous Canadians own this land.

And apart from the fact that property rights weren't an Indigenous concept until somewhat recently, the notion of my-ancestors-were-here-first isn't really winning the argument because beyond academic interest, it's sort of silly.