This document provides an executive summary of the 2019 Yearbook of Global Climate Action. It highlights examples of climate action being taken by cities, businesses, and civil society organizations. It finds that international cooperative initiatives aimed at climate action are achieving higher levels of output and performance over time. Momentum for climate action was built in 2019 through regional climate weeks and the UN Climate Action Summit. Key messages are that continued support is needed for implementing climate actions, enhancing collaboration, and increasing climate ambition from all actors. The summary emphasizes the urgent need to close global emissions gaps to meet the goals of the Paris Agreement.