This research examined how different types of beneficial fungi that live on tree roots respond to changes in climate and soil conditions across forests in western Canada. The study found that different fungi thrive in different environments – some prefer warmer conditions while others do better in colder areas. This has important implications for forest health and adaptation to climate change. Key impacts on everyday life: • Understanding these fungi-tree relationships helps predict how forests will cope with climate change • This knowledge can help forest managers choose appropriate trees and maintain healthy forests • Healthy forests provide essential ecosystem services like clean air, water filtration, and carbon storage • The findings help explain why some trees may struggle when transplanted to new environments • This research contributes to developing climate-resilient forestry practices