WMO provides the framework for international cooperation to advance meteorological, climatological, hydrological, and related environmental services, to improve well-being of all. This is why, WMO advocates for an Earth system approach to encompass all the weather-, climate- and water-related cycles traversing the globe, irrespective of national boundaries. The WMO e-Library is the official digital library of the World Meteorological Organization (WMO). It provides free and open access to WMO publications to foster international cooperation in meteorology, climatology, hydrology, and related fields.