CBC.  An environmental review panel's recommendation to impose noise limits on any Mackenzie Valley pipeline facilities built inside a bird sanctuary could scuttle the $16.2-billion project, its backers have told the National Energy Board.  Calgary-based Imperial Oil — the leader of the consortium that wants to build the natural gas pipeline — said it and its partners might not be able to conform to the noise restrictions recommended by the panel for facilities built within the Kendall Island Bird Sanctuary. Hill Times, by JEFF DAVIS, CYNTHIA MÜNSTER.  Canada's leading environmentalists say they're [...]