Coils of steel are seen at the Direct Strip Production Complex at Essar Steel Algoma in Sault Ste. Marie, Ont., on March 14, 2018. The federal government will announce up to $90 million in support for Ontario's Algoma Steel on Thursday in an commitment aimed at helping the producer deal with the pain of American tariffs on steel and aluminum, The Canadian Press has learned. THE CANADIAN PRESS/Justin Tang

The industrial carbon pricing system in Canada has come under fire during the federal election, raising uncertainty for companies about whether their investments in lowering emissions will pay off.