The Globe and Mail reports in its Wednesday edition that American aluminum giant Alcoa is warning that a looming trade war is placing 100,000 U.S. jobs at risk in the industry as the company urges the Trump administration to exempt the metal from threatened tariffs on shipments from Canada. The Globe's Brent Jang writes that two weeks ago, U.S. President Donald Trump announced 25-per-cent tariffs on steel and aluminum, including imports from Canada, that would start on March 12. "We're clearly advocating based on the fact that this is bad for the aluminum industry in the U.S.," Alcoa chief executive officer William Oplinger said Tuesday during a BMO mining conference in Florida. "It's bad for American workers. We're advocating with the administration to, at a minimum, get a Canadian exemption, which will allow two-thirds of that metal that gets consumed in the U.S. to continue to come across the border without a tariff." Pittsburgh-based Alcoa's global network for aluminum production includes operations in Quebec, the United States, Australia and Brazil. Mr. Trump has also said he wants to impose across-the-board 25-per-cent tariffs on goods that the U.S. imports from Canada and Mexico, scheduled to start on March 4.