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UNESCO World Heritage sites contain 20% of known species

The 1,157 protected sites account for less than 1% of Earth's surface but play vital roles as biodiversity hotspots.

Waterfalls in Croatia's Plitvice Lakes National Park, a World Heritage site since 1979.
Waterfalls in Croatia's Plitvice Lakes National Park, a World Heritage site since 1979. (AN/Jean Giroux/Unsplash)

A new analysis by UNESCO and the International Union for Conservation of Nature shows the world's most important cultural and historical landmarks are inhabited by one-fifth of all known species on the planet.

The 1,157 protected sites inscribed on UNESCO's World Heritage List account for less than 1% of Earth's surface but play vital roles as biodiversity hotspots, the Paris-based U.N. agency said on Thursday.

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