Overview
- The peer‑reviewed synthesis in Nature Reviews Earth & Environment compiles a database of surge‑type glaciers that cluster in the Arctic, High Mountain Asia and the Andes.
- Most of the 81 highest‑risk glaciers lie in the Karakoram above populated valleys, with past surges damaging infrastructure such as Pakistan’s Karakoram Highway.
- Surges drive six hazards: rapid glacier advance, river blockages that form lakes, subglacial outburst floods, sudden detachments and avalanches, widespread crevassing, and iceberg release.
- Evidence links climate warming and extreme weather to earlier‑than‑expected surges and shifting hotspots, with some regions surging more often and others declining as glaciers thin.
- Although only about 1% of glaciers by number, surge‑type glaciers span nearly one‑fifth of global glacier area, underscoring calls for better models, satellite surveillance and targeted field observations.