![Line graph showing downlward trend of glacier ice mass since 1970](/sites/default/files/2021-07/ClimateDashboard-glacier-mass-balance-graph-20210505-1400px_1.jpg)
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Ice loss relative to 1970 for the glaciers in the World Glacier Monitoring Service's climate reference network. Glacier mass balance is the annual balance between how much snow accumulates on a glacier and how much ice is lost through melting, sublimation, or iceberg calving. Including the preliminary values for 2019-2020, these glaciers have lost a volume of ice equivalent to about 27.5 meters (90 feet) of water spread out over each glacier. NOAA Climate.gov image, based on data from the WGMS.