OTTAWA — Prime Minister Mark Carney said there are signs the global and Canadian economies are slowing as U.S. President Donald Trump's trade war escalated again Friday, with China announcing it will push up retaliatory tariffs to 125 per cent. OTTAWA — Prime Minister Mark Carney said there are signs the global and Canadian economies are slowing as U.S. President Donald Trump's trade war escalated again Friday, with China announcing it will push up retaliatory tariffs to 125 per cent. "In the last week there have been a lot of developments in terms of U.S. tariffs policy, reactions from others…