UN-backed report finds even a brief 1.5C overshoot does lasting damage to the world's iceA report by 80 scientists convened by the International Cryosphere Climate Initiative and the UN Environment Programme, led by glaciologist James Kirkham, finds that even a temporary overshoot of 1.5C does largely permanent damage to glaciers, ice sheets, sea ice and permafrost, and calls the idea that 2C or 3C is manageable a myth.
A report by 80 scientists convened by the International Cryosphere Climate Initiative and the UN Environment Programme, led by glaciologist James Kirkham, finds that even a temporary overshoot of 1.5C does largely permanent damage to glaciers, ice sheets, sea ice and permafrost, and calls the idea that 2C or 3C is manageable a myth. Under current policies, glacier mass falls below 10% of today's in the Rockies, Alps, Iceland and Scandinavia, against 20 to 35% at 1.5C, and the Hindu Kush Himalaya, which supplies water to nearly a quarter of humanity, keeps 41% of its ice against 83%. Greenland and Antarctica are losing ice about six times faster than in the 1990s, and the authors put a safe long-term limit for the ice sheets near 1.0C, which means bringing warming back down from today's 1.3C. The Guardian reports it as leaders gather for COP31.


