The federal government of Canada has signaled it worries about the possibility of the next U.S. administration imposing a 25% tariff on all Canadian exports south, Reuters has reported. “We have some work to do to make sure we are effectively articulating the way in which tariffs would be counterproductive, and that's not just true of oil,” natural resources minister Jonathan Wilkinson said, as quoted by the publication. He added that “There's a lot of time and effort that will need to go into ensuring that we're having the appropriate…