Fig. S2. Distribution of the World's protected areas among the main Ecoregions of the world. The World Database on Protected Areas (WDPA) is developed by the United Nations Environmental Program (UNEP) and the International Union for Conservation of Nature (IUCN). The WDPA is the most comprehensive global database of marine and terrestrial protected areas. The ecoregions of the world are provided by the Nature Conservancy and defined by the World Wide Fund for Nature.