Three B-C First Nations are taking the federal government to court over its approval of the 6.8-billion-dollar expansion of the Trans Mountain pipeline. The Squamish and Tsleil-Waututh (sail-wha-tooth) nations, and the Coldwater Indian Band say the project poses a serious threat to the environment and to their way of life. They say the Crown failed to consult them before approving the project, which would run from Alberta to British Columbia’s south coast. The proposal — which received backing from the B-C government last week — would triple capacity along an existing pipeline corridor and bring a seven-fold spike in tanker traffic from its terminus in Burnaby.