For metrics, such as extent of protected areas, to inform global conservation efforts, the data sets on which the metrics are based must be comparable. The World Database on Protected Areas (WDPA) is the most comprehensive set of spatial data available on marine and terrestrial protected areas worldwide. The United Nations Environment Programme’s World Conservation Monitoring Centre (UNEP-WCMC) has compiled and updated these data yearly since 1981. These annual releases serve the global conservation community by providing updated, standardized data on protected areas.
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