As global temperatures rise, extreme heat could threaten athletes, fans, workers and officials during this year's World Cup games. Sixteen cities across the United States , Mexico and Canada will be hosting the 2026 World Cup in June and July. On average, July is the hottest month of the year for the contiguous U.S., according to the National Oceanic and Atmospheric Administration, and it’s only gotten warmer since record-keeping began in 1895. Wet bulb globe temperatures, which factor humidity, wind speed, sun angle and more, could exceed 90 F (32 C) in the afternoons in the Texas cities of Dallas and Houston and Monterrey, Mexico, research shows. “Almost all of the host locations, 14 out of 16 of them, experience levels of extreme heat, which could be potentially dangerous to players, match officials and possibly spectators,” said Donal Mullan, a senior lecturer at Queen’s University Belfast who lead a paper last year examining the heat risks of this year's host cities.…