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IUCN has published the 2017 World Heritage Outlook 2, examining status of the natural UNESCO World Heritage Sites since the first Outlook in 2014. Overall, there is no improvement but there has been change in status (positive or negative) for 26 of 241 sites. Threats are increasing to World Heritage Sites, with climate change the fastest growing and invasive species, climate change and tourism the largest current threats. Planned infrastructure development pressure is increasing. Improved outlooks for 14 sites are described as a result of sustained action on nature conservation.
Interactive map is at http://www.worldheritageoutlook.iucn.org/ and the full report at https://portals.iucn.org/library/sites/library/files/documents/2017-053.pdf