The Climate-Smart Agriculture Sourcebook draws together a wide range of knowledge and expertise on the concept of Climate-Smart Agriculture (CSA) to better guide policy makers, programme managers, sectoral experts, academics, extensionists, as well as practitioners to make the agricultural sectors (crops, livestock, fisheries and forestry) more sustainable and productive, while responding to the challenges of climate change and food security. This new fully revised digital platform edition of the CSA Sourcebook reflects new scientific insights as well as valuable CSA implementation experience obtained since the publication of the first edition. Five new modules were added: Climate change adaptation and mitigation, Integrated production systems, Supporting rural producers with knowledge of Climate-Smart Agriculture, The role of Gender in Climate-Smart Agriculture, and The theory of change for the CSA approach: a guide to evidence-based implementation at the country level.