Responding to climate change challenges requires collective action from all countries, governments, cities, communities, businesses and private citizens. With US$10.3 billion currently pledged, the Green Climate Fund (GCF) is the world’s largest fund dedicated to the fight against climate change. Designed to be the main financial instrument to mobilise US$100 billion per year by 2020 from both public and private sources, the GCF is the centrepiece to address the pressing mitigation and adaptation needs of developing countries.