by Nina LARSON Agence France-Presse GENEVA, Switzerland (AFP) — Climate change has become the biggest threat to UN-listed natural world heritage sites like glaciers and wetlands, and has pushed Australia’s Great Barrier Reef into “critical” condition, conservationists said Wednesday. The International Union for Conservation of Nature (IUCN) revealed in a new report that shifts due to the changing climate now imperil a full third of the 252 UNESCO-listed natural sites around the globe. Overall, 94 […]