who cook and spend much more of their time indoors. Barnes, Krutilla, and Hyde provide the first worldwide assessment of the energy transition as it occurs in urban households, drawing upon data collected by the World Bank Energy Sector Management Assistance Programme (ESMAP). From 1984-2000, the program conducted over 25,000 household surveys in 45 cities spanning 12 countries and 3 continents. Additionally, GIS mapping software was used to compile a biomass database of vegetation patterns surrounding 34 cities. Using this rich set of data, the authors describe problems and policy options associated with each stage in the energy transition. The authors show how the poorest are most vulnerable to changes in energy markets and demonstrate how the collection of biomass fuel contributes to deforestation. Their book serves as an important contribution to development studies, and as a guide for policymakers hoping to encourage sustainable energy markets and an improved quality of life for growing urban populations.