Figure 6a: Synthesised changes in the likelihood of exceeding a 28°C WBGT threshold during the tournament period across selected World Cup host stadiums in the 2026 climate relative to a 0.7°C cooler climate representing 1994, the last time FIFA hosted a World Cup in the United States. Observation-based dataset (ERA-Land) is shown in blue, climate model results in red, and the synthesised estimates in magenta. Coloured bars indicate a 95% confidence interval obtained by bootstrapping; where no bar is shown, the uncertainty was found to be infinite. Empty panels indicate an infinite return period in the current climate, making estimation of the change in likelihood impossible.