Climate change may increase heat-stress conditions that impair player performance in nearly every match of the 2026 FIFA World Cup [1].
This projection poses a significant risk to athlete health and the competitive integrity of the tournament as host cities face rising global temperatures. The intersection of extreme weather and high-intensity sport could force organizers to reconsider scheduling or venue management to protect players.
Researchers studying climate impacts on sport said that rising mercury levels may act as a "spoilsport" during the event [3]. The tournament will take place across the U.S., Canada, and Mexico, with cities like Atlanta, Georgia, serving as key examples of locations vulnerable to heat-stress thresholds [1, 2].
There is a discrepancy among reports regarding the extent of the impact. Some findings suggest that heat conditions could negatively affect player performance during almost every match [1]. Other data indicates that nearly one in every four matches could be played in conditions exceeding heat-stress thresholds [3].
These environmental challenges coincide with the tournament's own ecological footprint. Reports said the 2026 World Cup could generate roughly twice the carbon emissions of previous editions [4]. Specifically, the event could produce twice the emissions of the Qatar 2022 World Cup [5].
This increase in emissions is attributed to the expanded scale of the tournament and the thousands of flights required to move teams and fans across three different countries [4]. The risk of extreme heat events is driven by the same global warming trends contributing to these emissions [3, 6].
“Climate change may increase heat-stress conditions that impair player performance in nearly every match.”
The 2026 World Cup serves as a critical case study for the viability of hosting massive sporting events in a warming climate. With a projected carbon footprint double that of the 2022 tournament and a high probability of heat-induced performance declines, FIFA faces a dual crisis: the event's contribution to climate change and the immediate physical danger that climate change poses to the athletes.
