Stéphane Hallegatte is a senior economist at the World Bank. His work includes climate change vulnerability and adaptation, green growth strategies, urban economics and environmental policies, and disaster risk management. He was lead author of IPCC reports, and co-led with Marianne Fay the World Bank report “Decarbonizing Development.” He was the lead author of “Shock Waves: Managing the Impacts of Climate Change on Poverty,” on which this post is based.