Prominent global scientists have cautioned FIFA that its heat protection plans for the men's 2026 World Cup fall short and may endanger athletes with serious health risks.

In an open letter, top international specialists in health, climate science, and athletic performance argue that the organization's guidelines fail to align with modern research and lack justification. They urge FIFA to adopt tougher safeguards, such as extended cooling periods and precise rules for suspending or delaying matches amid severe weather.

Intense heat looms over the upcoming summer event across the United States, Canada, and Mexico, as studies predict hazardous conditions at 14 of the 16 selected stadiums.

Regions in the southern United States and northern Mexico often see daytime temperatures in the low to mid-30s Celsius, spiking toward 40C during peak heat waves.

Accounting for temperature, humidity, wind, and solar radiation, athletes in these host cities face the highest threat of severe physiological heat strain.

FIFA affirms its dedication to safeguarding the well-being of players, officials, supporters, volunteers, and personnel, incorporating climate hazards into event preparations.

To support player welfare, FIFA mandates three-minute cooling breaks during each half of all matches, irrespective of conditions.

Climate-controlled seating areas will be provided for coaches and reserves at every outdoor game.

The organization employs the premier metric for sports heat assessment, the Wet Bulb Globe Temperature (WBGT), which evaluates bodily heat load by integrating temperature and moisture. A WBGT near 28C signals substantial heat stress risks for top-tier competitors.

Per FIFA's emergency protocols, when WBGT approaches, reaches, or surpasses 32C, officials must determine necessary steps to avert heat illnesses.

FIFA has also prepared fan accommodations for high-heat predictions, permitting entry with sealed water bottles and enabling extra cooling features like shaded zones, mist fans, chilled transport, and boosted hydration stations.