This nexus brief synthesizes the findings of recent publications on mountains and climate change, in particular IPCC Cross-Chapter Paper 5: Mountains (2022) and the OECD Development Co-operation Working Paper: Strengthening climate resilience in mountainous areas (2021). According to the latest IPCC reports, many mountain regions are experiencing climate change impacts with serious consequences for people and ecosystems – reductions in snow cover extent and duration, loss of glacier mass, thawing of permafrost, increases in the number and size of glacial lakes and changes in seasonal weather patterns – all related to higher temperatures.