300 Glaciers Have Disappeared from the American West Since the Mid‑20th Century — the Survivors Have a Few Things in Common
AI-summarised brief · reviewed before publication
A 2026 PNAS study reports that 300 of the United States’ 1,450 western glaciers have vanished since the mid‑20th century, shrinking total glacier area by 35%. The remaining glaciers are small, typically a tenth of a square mile, and survive only in shaded, topographically protected niches. The fastest loss occurs in Montana’s Beartooth‑Absaroka range, at 1.5 ft of ice thickness per year, while Washington’s larger glaciers lose about half a foot annually. The loss threatens alpine ecosystems and, in Washington, hydropower supplies.
💡 Why It Matters
- · The rapid disappearance of these glaciers signals a tangible loss of critical water reservoirs that sustain late‑summer ecosystems and regional hydropower.
- · Their decline underscores the urgency of addressing climate change impacts on freshwater resources.