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Environment & Climate

Overshooting 1.5C could permanently damage glaciers and ice sheets, UN report warns

Slashdot reports that a UN-backed report says temporary overshoot of 1.5C could cause lasting ice losses, and that Greenland and Antarctic ice is melting about six times faster than in the 1990s.

Published Nov 7, 2026 · 13:45 UTC1 reports

The short version

  • Slashdot reports that a UN-backed report warns temporary overshoot of the Paris 1.5C target could cause permanent, widespread losses of glaciers, snow and polar ice sheets.[Slashdot]
  • Greenland and Antarctic ice sheets are melting about six times faster than in the 1990s, and glaciers would keep about 70% of their volume over centuries only if long-term heating fell to 0.8C, the report says.[Slashdot]
  • Under current policies, which imply 2.8C of heating, glacier mass would fall below 10% in the Rockies, Alps, Iceland and Scandinavia.[Slashdot]
  • Scientists say a safe long-term limit for polar ice sheets may lie near 1.0C of heating, or lower.[Slashdot]

Key facts

  • A UN-backed report warns temporary overshoot of the Paris 1.5C target could cause permanent, widespread losses of glaciers, snow and polar ice sheets.[Slashdot]
  • Greenland and Antarctic ice sheets are melting about six times faster than in the 1990s, according to the report.[Slashdot]
  • The report found glaciers would preserve about 70% of their current volume over centuries if long-term heating fell to 0.8C.[Slashdot]
  • Scientists said a safe long-term temperature limit for polar ice sheets lies closer to 1.0C of global heating, and possibly lower.[Slashdot]
  • Lead author James Kirkham, a glaciologist at ICCI, said snow and ice respond rapidly to every fraction of a degree of warming.[Slashdot]
  • Current policies, resulting in 2.8C of global heating, would reduce glacier mass to below 10% in the Rockies, Alps, Iceland and Scandinavia.[Slashdot]
  • At 1.5C of warming, about 20-35% of glacier mass would remain in regions such as the Rockies, Alps, Iceland and Scandinavia, according to the report.[Slashdot]

What remains uncertain

  • The projected glacier and ice losses at 1.5C, 2.8C and 0.8C are the report's estimates, and the available reporting does not detail the underlying methodology.[Slashdot]
  • Only Slashdot is reporting this event in the provided reporting, so the findings have not been independently confirmed by other outlets here.[Slashdot]

Sources

Outlet counts describe coverage, not independent confirmation. Reports may share a wire service or original source.