Home / Environment / Global Ice Sheets Face Perilous Melting
Global Ice Sheets Face Perilous Melting
2 Nov
Summary
- Temporary global temperature overshoot poses severe threats to glaciers and ice sheets.
- Cryosphere damage is largely permanent, even if warming returns below 1.5C.
- Current policies could lead to 2.8C warming, decimating glaciers worldwide.
A UN-backed report highlights the severe risks of exceeding the Paris Agreement's 1.5C warming target, even temporarily. Earth's cryosphere, encompassing all ice and snow, faces dangerous melting that could lead to permanent losses. Scientists urge that any overshoot must be brief, with a long-term goal of reducing warming below 1C by 2150.
Current policies are projected to result in approximately 2.8C of global heating, which would cause widespread permafrost thaw and potential disruption to ocean circulation. This level of warming would lead to significant ice loss, with glaciers potentially retaining less than 10% of their mass in regions like the Rockies and Alps.
The report emphasizes that damage to glaciers and ice sheets is often irreversible on human timescales. Even if temperatures return to 1.5C, glacier melt will continue, raising sea levels and threatening water security for millions. The Greenland and Antarctic ice sheets are melting at an accelerated rate, contributing to sea level rise.
The consequences of cryosphere loss extend globally, impacting water sources for nearly a quarter of humanity, as seen in the Hindu Kush Himalayas. The report, compiled by 80 scientists, underscores the urgent need for drastic emission reductions to mitigate these critical climate impacts.
