This document provides an overview of the Global Mountain Ecosystem-based Adaptation (EbA) Programme implemented in Nepal, Peru and Uganda from 2014-2017. The programme was led by UNDP, IUCN and UNEP and aimed to build the case for EbA through demonstrating its benefits. Key activities included participatory vulnerability assessments, pilot EbA measures across sectors like water and agriculture, and cost-benefit analyses. Lessons included how EbA secured environmental, social and economic benefits but required long-term planning and addressing non-climatic threats. The document also examines opportunities and challenges for upscaling EbA through policy changes and financing schemes.