The cover captures the morning mist at Kaeng Krachan National Park in Thailand. Like every other aspect of life on Earth, forests are facing increased challenges posed by climate change. A collection of papers in this week’s issue probes the vulnerabilities and potential resilience of forests in a warming world. Three studies focus on North America: one examining the response of boreal species to warming and drought, another analysing the timing of stem growth in temperate deciduous forests, and a third revealing migration of white spruce (Picea glauca) into the Arctic tundra. In the tropics, one paper investigates the 

impact of phosphorus availability in the Amazon, while another assesses the reasons for increased mortality of tropical trees. Finally, a sixth paper shows how satellite imaging can be combined with machine learning to identify declining resilience in the world’s forests.