Cryosphere decline beyond safe planetary limits, putting conditions for human society at risk

Key Points:

• New research published at COP31 warns that human-driven climate change is degrading the cryosphere—Earth’s frozen regions such as ice sheets, glaciers, sea ice, permafrost, and snow cover—beyond safe environmental limits, threatening planetary stability and human societies.
• The cryosphere plays a critical role in regulating Earth's energy, water, carbon, and methane cycles, and its degradation accelerates global warming, sea level rise, ecosystem damage, and extreme weather events, particularly impacting polar, mountainous, coastal, and low-lying communities.
• The study, led by the Stockholm Resilience Center and involving over 30 international scientists, introduces a "safe operating space" framework based on the stable Holocene epoch, concluding that current cryosphere conditions have surpassed these boundaries, risking irreversible feedback loops.
• Researchers urge policymakers to adopt the safe operating space framework to guide emission reductions, including greenhouse gases and black carbon, and to limit local disturbances, emphasizing the need for coordinated international governance of the cryosphere.
• Released during COP31 and the U.N. Decade of Action for Cryospheric Sciences (2025–2034), the report calls for urgent global action to preserve frozen landscapes and the vital freshwater, ocean, and ecosystem services they provide.