Summary/Abstract
This study examines the impact of exceeding 1.5°C of global warming above pre-industrial levels on mountain glaciers, sea levels, and water availability. It finds that, even if the climate were to return to below 1.5°C, exceeding that threshold would cause irreversible harm to mountain glaciers. The study uses a simulation to estimate that “a 3.0 °C peak-and-decline scenario will lead to 11% more global glacier mass loss by 2500 compared with limiting warming to 1.5 °C without overshooting.”