Summary: Economists often recommend fuel taxes to curb greenhouse gas emissions from automobiles in cities. But the effectiveness of these taxes depends heavily on other factors, like the availability of public transportation, and the density of a city. A recent paper by Stephane Hallegatte, Senior Economist in the World Bank's Climate Change Unit, and his colleagues finds that taxes are twice as effective when accompanied by an investment in public transport. In this interview, Hallegate discusses his paper and findings. For more information, visit: http://www.worldbank.org/en/research
