Over 450 Olympians, representing more than 90 countries and over 50 sports, have signed an open letter calling on the incoming President of the International Olympic Committee (IOC) to make caring for our planet their top priority.
From rising temperatures and declining snowfall to worsening air pollution and unpredictable weather, climate change is disrupting training, competition schedules and athlete performance - as well as posing a growing harm to many of the countries that take part in Olympic Games.
Scroll down to see the full list of signatories, including over 130 Olympic flag bearers.
Extreme heat is affecting athlete performance and safety at the Summer Olympics. The Tokyo 2020 Games were the hottest on record, with nearly 1 in every 100 athletes suffering from heat-related illnesses.
More cities are facing conditions that push the limits of safe competition, and projections show that at least half of the cities bidding for the 2036 Olympics could experience dangerous heat levels.
Snowfall patterns are shifting and traditional winter sports regions have seen their seasons shrink by several weeks, making it harder to find reliable locations to host the Winter Olympics.
Artificial snow is increasingly used, but it is costly and less sustainable. Without action to reduce emissions, temperature increases will mean only 52 previous host cities will reliably be able to host the Olympics by 2050.