Innovation is key to green growth. It helps decouple growth from natural capital depletion and contributes to economic growth and job creation. Business is the driver of innovation, but governments need to provide clear and stable market signals, e.g. through carbon pricing. This book explores policy actions for the deployment of new technologies and innovations as they emerge: investment in research and development, support for commercialisation, strengthening markets and fostering technology diffusion. Competition will be essential to bring out the best solutions.