green growth has been recognised as a key policy as it can address economic growth social inclusion and environmental sustainability at the same time especially fostering green growth in cities is critical because cities play disproportionately large roles in the economic and environmental performance of countries oecd box to do this it must catalyse investment and innovation which will underpin sustained growth and give rise to new economic opportunities oecd the global green growth institute gggi defines green growth as a development approach that seeks to deliver economic growth that is both environmentally sustainable and socially inclusive gggi