Canada's ambassador to the United States says stopping the Keystone XL pipeline won't stop an increased amount of Alberta oil from reaching the Gulf Coast.

Gary Doer delivered a speech in Edmonton on Friday, saying shipping oil by rail south of the border has skyrocketed in the last two years with a resulting increase in greenhouse gas emissions.

He says that's why he will continue trying to persuade the U.S. government to approve the Keystone pipeline from Alberta to Texas.

Doer says it helps that decision-makers in every U.S. state through which the line would run are pushing for its approval.

He also lauded Premier Alison Redford for going to Washington to lobby for Keystone and to outline Alberta's efforts to reduce emissions that lead to climate change.