Mounting opposition from environmentalists and in his home province of Quebec has not quelled NDP Leader Tom Mulcair's enthusiasm for a west-east pipeline across Canada. Here are a few other controversial pipeline projects in the country: Keystone XL is a proposed 1,897-kilometre pipeline that would carry crude oil from Hardisty, Alta., to Steele City, Neb., where it would link up with other pipelines that run to the Gulf Coast and the U.S. Midwest.