The tasks of the WGMS are to continuously upgrade, collect and periodically publish glacier inventory and fluctuation data as well as to include satellite observations of remote glaciers and to assess ongoing changes. Users may search the World Glacier Inventory and request data, or download Fluctuations of Glaciers (FoG) and Mass Balance Bulletin (MBB) publications, describing changes in glacier mass, volume, area and length over time, in addition to the perennial distribution of glacier ice at the global scale.