When the G-20 leaders met on 24-25September 2009 in Pittsburgh, USA, they agreed in theirCommuniqué that, building on the efforts of many countriesto, reduce fossil fuel subsidies while preventing adverseimpact on the poorest?, they were committed to, rationalizeand phase out over the medium term inefficient fossil fuelsubsidies that encourage wasteful consumption.This draftreport has been developed jointly by the InternationalEnergy Agency (IEA), Organization of the Petroleum ExportingCountries (OPEC), Organization for Economic Cooperation andDevelopment (OECD) and World Bank in response to thisrequest. It draws on the relevant expertise and work of thefour tasked organizations, but also on input and commentsfrom other organizations and experts. The report includes:a) discussion of the scope of energy subsidies; b) estimatesof energy subsidies, and identification of the gaps in theexisting data and issues around the measurement of energysubsidies; c) modeling-based analysis of the implications ofphasing-out energy subsidies on the economy, includingsocio-economic and trade impacts, the environment, and theenergy sector; and d) suggestions for the implementation ofphase-out of inefficient subsidies leading to wastefulconsumption, drawing on country case studies, includingdiscussion of how to address social impacts.