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flag Climate change threatens 86% of global marathons by 2045 with unsafe temperatures, urging adaptation and urgent emissions cuts.

flag Climate change is reducing ideal weather for marathons, with a Climate Central analysis projecting that by 2045, 86% of 221 global marathons—including all seven World Marathon Majors—will face declining chances of optimal temperatures (39–50°F). flag Rising global temperatures, driven by human activity, have already pushed race conditions beyond safe limits in events like Tokyo and Berlin. flag Elite male runners in cities like Tokyo, Boston, and New York, and elite female runners in London, New York, and Berlin, will see reduced odds of ideal conditions despite women’s greater heat resilience. flag Athletes must adapt training and hydration strategies, while organizers are urged to consider earlier start times. flag Long-term solutions require urgent global action to cut fossil fuel use.

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