Paris – Climate experts challenged FIFA on Thursday after a warning that 1 in 4 of the 2026 World Cup games could take place in very hot conditions as global warming has increased the risk of extreme heat in North America since the U.S. hosted the 1994 tournament. Concerns about heat already prompted FIFA to mandate a cooling break during each half of the World Cup matches that will take place between June 11 and July 19 in 16 stadiums across the United States, Mexico and Canada. "Players and fans face a much higher risk of grueling heat and humidity at the 2026 World Cup compared to the 1994 tournament on the same continent," World Weather Attribution (WWA), a network of climate scientists, said in a statement. WWA's scientific analysis estimates that 26 of the 104 matches could occur in conditions reaching at least 26 degrees Celsius wet bulb globe temperature (WBGT) — an index that measures how effectively the human body can cool itself under heat, humidity, sun exposure and wind.…