Heidi Sand knows how it is to accept a seemingly hopeless fight. “Since my cancer, I have a special relationship with probabilities and chances”, the 49-year-old German climber and sculptor write to me. “You have to believe in yourself and you should use any chance, no matter how small it is.” In 2010, Heidi was diagnosed with colon cancer at an advanced stage. She accepted the fight. Two years later, she climbed Mount Everest. In 2013, she summited Cho Oyu, her second eight-thousander. The following year, Sand and Billi Bierling were the first German women on top of Makalu. Now Heidi is committed to a climate protection project called “25zero”. During the upcoming climate summit in Paris, the Australian adventurer Tim Jarvis and his team want to point out the consequences of climate change for 25 still glaciated peaks at zero latitude, around the Equator. If nothing is done, says Jarvis, no ice or snow will remain on these mountains at the latest in 25 years – therefore “25zero”.

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