A novel study reveals a significant decline in glaciers on a global scale

Since 2000, the world's glaciers have lost 5% of their initial volume, and 273 billion tonnes of ice are disappearing every year - the equivalent of 3 Olympic swimming pools per second. These are the results of an in-depth study of the global evolution of glaciers (excluding the Antarctic and Greenland ice sheets) between 2000 and 2023, based for the first time on a combination of field measurements and satellite observations. This unprecedented study was carried out by the Glambie1  international consortium, made up of 35 research teams including researchers from CNRS, CNES, INRAE and IRD2 . The findings has been published in the magazine Nature on February 19.

The scientists also noted a record loss of glacier mass in 2022 and 2023 and revealed that the Alps and the Pyrenees in Europe have lost around 40% of their volume in less than a quarter of a century, which makes them the regions of the globe with the greatest relative loss of ice. 

The diversity and complementarity of the methods used3  in this study are sources of particular reliable data, enabling scientists to carry out increased and more regular monitoring4  of glacier melt. These results will feed into the next IPCC report, due in 2029.

• 1Glambie is a research initiative coordinated by the World Glacier Monitoring Service (WGMS), hosted by the University of Zurich, in collaboration with the University of Edinburgh and Earthwave Ltd.
• 2Glambie involves scientists from the Laboratoire d'études en géophysique et océanographie spatiales (CNES/CNRS/IRD/Université de Toulouse III - Paul Sabatier) and the Institut des géosciences de l'environnement (CNRS/INRAE/IRD/Université Grenoble Alpes).
• 3The French teams contributed in particularly to measurements of changes in glacier thickness using ASTER images from the Terra satellite and changes in mass using data from the GRACE satellites.
• 4