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Report: Climate change is closing the window for fast-marathons.

New research, released in advance of the New York City Marathon on Sunday, shows that climate change will limit the opportunity for world-record performances.

Athletes are concerned that rising temperatures will change the face of running marathons. Some cities will be more affected than others. Last month, Berlin's marathon was held in temperatures that were unseasonal at 75 degrees Fahrenheit.

Climate Central, a non-profit organization based in the United States, found that 86% (or 221 global marathons) analysed for their dates of 2025 are expected to experience a decline of the odds of running optimally by 2045. This includes all seven Abbott World Marathon Majors.

Mhairi Mclennan said that the findings reflect the growing challenges for elite runners.

Maclennan stated that "at the elite level, the conditions can make or break performance." "We train every day for years, managing our lives in order to perform at our best. But that elusive goal keeps slipping away as the ideal temperature becomes rarer.

Climate change isn't only about the races getting harder. It's also about knowing that record performances may soon be beyond reach if conditions continue to get hotter.

The report identifies the'sweet spot" for marathon temperatures which supports peak performance. Men perform better in cooler temperatures (on average 4 degrees Celsius, or 39 degrees Fahrenheit), while women do better with warmer temperatures (10 C).

However, the report warns that global heating is making it increasingly difficult to find these conditions.

Tokyo has the highest probability of having ideal temperatures for male elite runners (69%) but also the greatest decline projected by 2045.

Heat waves in 2025 have already driven race-day temperatures above the thresholds for peak performance. However, starting races earlier can improve conditions modestly.

Catherine Ndereba, former world record holder in the sport, said that it was already adapting.

Kenyan Ndereba said that climate change had changed the marathon. He is a four-time Boston champion, two-time World Champion and a world champion.

Dehydration can be a serious problem, and even simple mistakes in calculations can cause a race to end before it has begun. Even the strongest steps will fail if we do not take care of our environment.

Ibrahim Hussein echoed this sentiment. He is the first Kenyan ever to win the New York Marathon and the Boston Marathon.

Hussein stated that "the climate is now part of the course." If we don't preserve it, future records and enjoyment will be less likely. Reporting by Martyn Davis Editing by Toby Davis

(source: Reuters)