In an update to the joint UNESCO-WRI-IUCN report “World Heritage forests: carbon sinks under pressure”, new data reveals that fires have accounted for approximately 75% of tree cover loss in World Heritage sites. Steadily increasing tree cover loss due to fires, fueled by climate change, has led to record high emissions, and threatens the robust carbon sinks of forests in World Heritage sites. Since 2001, approximately 4.5 million hectares of forest—more than the area of Switzerland—have been lost across World Heritage sites, with fires responsible for around 75% of that loss. The vast majority — approximately 80% — of all fire-related tree cover loss occurred in high-latitude forests, primarily across North America and Siberia. Forests in Australia account for an additional 15% of the loss, while all other regions contributed approximately 5%.