Context: A new study published in Nature Climate Change projects that global glacier disappearance will peak around mid-century, with up to 4,000 glaciers vanishing annually under high-warming scenarios.
About Glacier Disappearance:
What it is?
- Glacier disappearance refers to the complete extinction of individual glaciers when their area falls below 0.01 sq km or their remaining ice volume drops below 1% of original levels, due to sustained warming and mass loss.
Key trends:
- Mid-century peak: Global glacier extinction is projected to peak between 2041–2055, depending on warming levels.
- Scale of loss:
- ~2,000 glaciers/year under +1.5°C warming
- ~4,000 glaciers/year under +4.0°C warming
- Regional variation:
- Small-glacier regions (European Alps, Caucasus) see early peaks before 2040.
- Large-glacier regions (Greenland periphery, Arctic Canada) face delayed but prolonged loss.
- High-Mountain Asia: Hosts over one-third of global glaciers and strongly shapes the global mid-century extinction peak.
Key reasons:
- Rising global temperatures increasing melt rates beyond accumulation.
- Prevalence of small glaciers, which respond rapidly to warming.
- Delayed response of large glaciers, leading to sustained long-term loss.
- Insufficient climate mitigation, locking in future ice loss even if emissions stabilise later.
Relevance for UPSC Examination
- GS Paper I – Physical Geography
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- Glaciers, cryosphere dynamics, climate–landform interaction
- Impact of glacier retreat on rivers and geomorphology
- GS Paper III – Environment & Climate Change
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- Climate change impacts, global warming thresholds (1.5°C vs 2°C+)
- Water security, disaster risk (GLOFs), and ecosystem services
- International climate negotiations and mitigation urgency
