Forest ecosystems are home to the vast majority of the world’s terrestrial species, but they are also under the greatest pressure from human activities. Ranging in size from the Vallée de Mai, Seychelles (18 hectares), to Lake Baikal, Russian Federation (8.8 million hectares), World Heritage forest sites have a total surface area of over 75 million hectares, or 1.5 times the surface area of ...