In brief<\/strong><\/h2>\n\n\n\n\n- Even if the rise in global temperatures were to stabilise at its current level, it is projected that the world would lose around 40 per cent of its glaciers.<\/li>\n\n\n\n
- If global warming can be limited to +1.5\u202f\u00b0C, it may be possible to preserve twice as much glacier ice (54 per cent)\u00a0as in a scenario where temperatures rise by +2.7\u202f\u00b0C\u00a0(only 24 per cent).<\/li>\n\n\n\n
- This conclusion was reached by a research team with participation of ETH Zurich researchers, based on a new, multi-centennial analysis of global glacier evolution.<\/li>\n<\/ul>\n<\/blockquote>\n\n\n\n
The findings, published today in the prestigious journal Science<\/em>, are striking. Even if global temperatures were stabilised at today\u2019s level of 1.2\u00b0C, an estimated 39 per cent of global glacier mass would still be lost compared to 2020 levels\u2014contributing over 10 centimetres to global sea-level rise.<\/p>\n\n\n\nIn the new study, an international team of 21 scientists from ten countries used eight glacier models to calculate the potential ice loss from more than 200,000 glaciers outside Greenland and Antarctica. The team evaluated a wide range of global temperature scenarios, assuming that temperatures would remain constant for thousands of years in each scenario.<\/a><\/p>\n\n\n\n![\"\"](\"https:\/\/www.sonnenseite.com\/wp-content\/uploads\/2025\/06\/ETH-Zurich-Vrije-Universiteit-Brussel_Gletscher-1024x646.jpg\")
<\/a>\u00a0The graph illustrates the loss of glacier mass worldwide as global temperatures rise. It shows that more glaciers\u2014particularly in Asia and New Zealand\u2014could be preserved if global warming is limited to 1.5\u00b0C compared to the 2.7\u00b0C path resulting from current policies. Each circle represents the proportion of glacier mass projected to be lost even if temperatures remain at today\u2019s level of +1.2\u00b0C (blue segment). The colored lines indicate the additional long-term loss expected if warming continues. (Graphik: ETH Zurich \/ Vrije Universiteit Brussel)<\/figcaption><\/figure>\n<\/div>\n\n\n<\/p>\n\n\n\n
\u201cThe choices we make today will resonate for centuries, determining how much of our glaciers can be preserved,\u201d says Harry Zekollari, co-lead author from Vrije Universiteit Brussel, who began this research as a postdoctoral fellow at the Chair of Glaciology in the Department of Civil, Environmental and Geomatic Engineering (D-BAUG) at ETH Zurich.<\/p>\n\n\n\n
Looking beyond 2100 reveals new insights<\/h3>\n\n\n\n
In all scenarios, the glaciers lose mass rapidly over decades and then continue to melt at a slower pace for centuries \u2014 even without additional warming. This long-term response means glaciers will continue to feel the effects of today\u2019s heat far into the future, gradually retreating to higher altitudes before reaching a new equilibrium.<\/p>\n\n\n\n
\u201cOne of the key strengths of our study is that we were able, for the first time, to project global glacier evolution over multi-centennial timescales, and did so using eight models instead of one or two,\u201d explains Harry Zekollari. \u201cMost glacier studies stop at 2100, which is problematic when simulating the long-term impact of today\u2019s climate policies, given the long-term response of glaciers over time.\u201d<\/p>\n\n\n\n
For example, while studies limited to the year 2100 estimate that around 20 per cent of today\u2019s glacier mass will be lost regardless of future warming, the new study reveals that nearly twice as much would vanish under present-day conditions when multi-centennial timescales are considered. \u201cWe find that around 40 per cent of glacier mass is effectively \u2018doomed\u2019 to disappear,\u201d says co-lead author Harry Zekollari.<\/p>\n\n\n\n
Melting glaciers reveal the reality of global warming<\/h3>\n\n\n\n
“Glaciers are good indicators of climate change because their retreat allows us to see with our own eyes how climate is changing. However, since they adjust over longer timescales, their current size vastly understates the magnitude of climate change that has already happened. The situation for glaciers is actually far worse than visible in the mountains today,” says co-lead author Lilian Schuster from the University of Innsbruck.<\/p>\n\n\n\n
Beyond contributing to sea-level rise, glacier loss has far-reaching consequences. It threatens freshwater availability, increases the risk of glacier-related hazards such as floods and landslides, and jeopardizes glacier-fed tourism economies. These cascading impacts will be felt across regions and generations.<\/p>\n\n\n\n
\u201cThese effects underscore the critical importance of present-day climate policies,\u201d says Harry Zekollari. \u201cOur study makes it painfully clear that every fraction of a degree matters. If we manage to limit global warming to +1.5\u00b0C instead of +2.7\u00b0C, we could still save twice as much glacier ice.\u201d<\/p>\n\n\n\n
Current policies are projected to lead to an average global warming of around +2.7\u00b0C. As Zekollari emphasizes, the degree of warming between +1.5\u00b0C and +3.0\u00b0C plays a decisive role in glacier loss. In their study, the researchers show that if global warming reaches 2.7\u00b0C, only 24 per cent of today\u2019s glacier mass would remain. However, if the temperature rise is limited to 1.5\u00b0C, as targeted by the Paris Agreement, 54 per cent could be preserved \u2014 more than twice as much ice. Put simply: for every additional 0.1\u00b0C of warming, the world risks losing approximately 2per cent more of its glacier ice.<\/p>\n\n\n\n
Contributing to the UN-Year of Glaciers’ Preservation<\/h3>\n\n\n\n
\u201cThis study is a major contribution to the United Nations International Year of Glaciers’ Preservation, emphasizing the urgent need for global climate action to protect the world\u2019s glaciers,\u201d says Daniel Farinotti, Professor of Glaciology at ETH Zurich and the Swiss Federal Institute for Forest, Snow and Landscape Research WSL.<\/p>\n\n\n\n
His research group at the Laboratory of Hydraulics, Hydrology and Glaciology (VAW) played a central role in producing the new findings. The entire study led by Zekollari and Schuster was conducted as part of the Glacier Model Intercomparison Project (GlacierMIP) and coordinated by the Climate and Cryosphere (CliC) Project of the World Climate Research Programme (WCRP).<\/p>\n\n\n\n
Farinotti notes that the release of the Science<\/em> study coincides with the opening of the external page High-Level International Conference on Glaciers’ Preservation<\/a>, initiated by the President of Tajikistan through the UN Resolution that established both the UN Year of Glaciers’ Preservation and, later, the UN Decade of Action for the Cryospheric Sciences 2025-2034.<\/p>\n\n\n\nOn the Swiss side, the Federal Department of Foreign Affairs (FDFA) was invited to support the organisation of the event, particularly in drafting what is intended to become the “Dushanbe Glacier Declaration”. Daniel Farinotti, for his part, is acting as an advisor to the FDFA in the preparation of the declaration.<\/p>\n\n\n\n
\n- Zekollari, H., Schuster, L., et al.: Glacier preservation doubled by limiting warming to 1.5\u00b0C versus 2.7\u00b0C. In:\u00a0Science<\/em>, 29.\u00a0Mai\u00a02025. DOI:\u00a0externe Seite 10.1126\/science.adu4675<\/a><\/li>\n\n\n\n
- Originaltext: ETH Z\u00fcrich<\/a><\/li>\n\n\n\n
- Pressemitteilung Vrije Universiteit Brussel<\/a><\/li>\n<\/ul>\n\n\n\n
Source<\/h5>\n\n\n\n
The findings, published today in the prestigious journal Science<\/em>, are striking. Even if global temperatures were stabilised at today\u2019s level of 1.2\u00b0C, an estimated 39 per cent of global glacier mass would still be lost compared to 2020 levels\u2014contributing over 10 centimetres to global sea-level rise.<\/p>\n\n\n\n In the new study, an international team of 21 scientists from ten countries used eight glacier models to calculate the potential ice loss from more than 200,000 glaciers outside Greenland and Antarctica. The team evaluated a wide range of global temperature scenarios, assuming that temperatures would remain constant for thousands of years in each scenario.<\/a><\/p>\n\n\n <\/p>\n\n\n\n \u201cThe choices we make today will resonate for centuries, determining how much of our glaciers can be preserved,\u201d says Harry Zekollari, co-lead author from Vrije Universiteit Brussel, who began this research as a postdoctoral fellow at the Chair of Glaciology in the Department of Civil, Environmental and Geomatic Engineering (D-BAUG) at ETH Zurich.<\/p>\n\n\n\n In all scenarios, the glaciers lose mass rapidly over decades and then continue to melt at a slower pace for centuries \u2014 even without additional warming. This long-term response means glaciers will continue to feel the effects of today\u2019s heat far into the future, gradually retreating to higher altitudes before reaching a new equilibrium.<\/p>\n\n\n\n \u201cOne of the key strengths of our study is that we were able, for the first time, to project global glacier evolution over multi-centennial timescales, and did so using eight models instead of one or two,\u201d explains Harry Zekollari. \u201cMost glacier studies stop at 2100, which is problematic when simulating the long-term impact of today\u2019s climate policies, given the long-term response of glaciers over time.\u201d<\/p>\n\n\n\n For example, while studies limited to the year 2100 estimate that around 20 per cent of today\u2019s glacier mass will be lost regardless of future warming, the new study reveals that nearly twice as much would vanish under present-day conditions when multi-centennial timescales are considered. \u201cWe find that around 40 per cent of glacier mass is effectively \u2018doomed\u2019 to disappear,\u201d says co-lead author Harry Zekollari.<\/p>\n\n\n\n “Glaciers are good indicators of climate change because their retreat allows us to see with our own eyes how climate is changing. However, since they adjust over longer timescales, their current size vastly understates the magnitude of climate change that has already happened. The situation for glaciers is actually far worse than visible in the mountains today,” says co-lead author Lilian Schuster from the University of Innsbruck.<\/p>\n\n\n\n Beyond contributing to sea-level rise, glacier loss has far-reaching consequences. It threatens freshwater availability, increases the risk of glacier-related hazards such as floods and landslides, and jeopardizes glacier-fed tourism economies. These cascading impacts will be felt across regions and generations.<\/p>\n\n\n\n \u201cThese effects underscore the critical importance of present-day climate policies,\u201d says Harry Zekollari. \u201cOur study makes it painfully clear that every fraction of a degree matters. If we manage to limit global warming to +1.5\u00b0C instead of +2.7\u00b0C, we could still save twice as much glacier ice.\u201d<\/p>\n\n\n\n Current policies are projected to lead to an average global warming of around +2.7\u00b0C. As Zekollari emphasizes, the degree of warming between +1.5\u00b0C and +3.0\u00b0C plays a decisive role in glacier loss. In their study, the researchers show that if global warming reaches 2.7\u00b0C, only 24 per cent of today\u2019s glacier mass would remain. However, if the temperature rise is limited to 1.5\u00b0C, as targeted by the Paris Agreement, 54 per cent could be preserved \u2014 more than twice as much ice. Put simply: for every additional 0.1\u00b0C of warming, the world risks losing approximately 2per cent more of its glacier ice.<\/p>\n\n\n\n \u201cThis study is a major contribution to the United Nations International Year of Glaciers’ Preservation, emphasizing the urgent need for global climate action to protect the world\u2019s glaciers,\u201d says Daniel Farinotti, Professor of Glaciology at ETH Zurich and the Swiss Federal Institute for Forest, Snow and Landscape Research WSL.<\/p>\n\n\n\n His research group at the Laboratory of Hydraulics, Hydrology and Glaciology (VAW) played a central role in producing the new findings. The entire study led by Zekollari and Schuster was conducted as part of the Glacier Model Intercomparison Project (GlacierMIP) and coordinated by the Climate and Cryosphere (CliC) Project of the World Climate Research Programme (WCRP).<\/p>\n\n\n\n Farinotti notes that the release of the Science<\/em> study coincides with the opening of the external page High-Level International Conference on Glaciers’ Preservation<\/a>, initiated by the President of Tajikistan through the UN Resolution that established both the UN Year of Glaciers’ Preservation and, later, the UN Decade of Action for the Cryospheric Sciences 2025-2034.<\/p>\n\n\n\n On the Swiss side, the Federal Department of Foreign Affairs (FDFA) was invited to support the organisation of the event, particularly in drafting what is intended to become the “Dushanbe Glacier Declaration”. Daniel Farinotti, for his part, is acting as an advisor to the FDFA in the preparation of the declaration.<\/p>\n\n\n\n![\"\"](\"https:\/\/www.sonnenseite.com\/wp-content\/uploads\/2025\/06\/ETH-Zurich-Vrije-Universiteit-Brussel_Gletscher.jpg\")
<\/a>Looking beyond 2100 reveals new insights<\/h3>\n\n\n\n
Melting glaciers reveal the reality of global warming<\/h3>\n\n\n\n
Contributing to the UN-Year of Glaciers’ Preservation<\/h3>\n\n\n\n
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Source<\/h5>\n\n\n\n