Air quality in Toronto among worst in the world amid wildfire smoke, global tracker shows

BANFF, Alta. — The heads of the world’s richest economies are converging on Alberta today for one of the most high-stakes G7 meetings in recent memory amid a U.S.-led global tariff war and the growing crisis in the Middle East. On many of the G7’s key issues — namely the global trade war and Israel’s military operations in Gaza — Trump and the rest of the G7 leaders are largely on opposite sides. Canadian Prime Minister Mark Carney’s job as chair of the summit in Kananaskis, Alta., is to mediate discussions to make sure the tense alliance doesn’t blow up. And that job has never...