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World Natural Heritage Sites (WNHS) are treasures that need human protection and invite appreciation, which makes conservation of WNHS an urgent task. This paper assesses where in the world threats are most pressing and which WNHS require emergency assistance. Using an analysis of "hot spots" and inverse distance weighting, it finds that Africa is the region where WNHS are least secure. Reports of the state of the conservation of WNHS describe the many threats that exist. Of these, management activities and institutional factors are the primary threats. The paper suggests relevant measures to improve the WNHS security.