Abu Dhabi, UAE, 11 October 2025, (IUCN World Conservation Congress) – Climate change is now threatening 43% of natural World Heritage sites, surpassing all other threats, according to the new IUCN World Heritage Outlook 4 published today. Invasive alien species (IAS) remain the second most prevalent current threat, affecting 30% of all sites. The report also warns of a sharp rise in the risk from wildlife and plant diseases. In 9% of sites there is a high or very high threat posed by pathogens, up from just 2% in 2020.
Escalating climate threats, invasive alien species and pathogens leave natural World Heritage at risk