The Global Energy Assessment (GEA) brings together over 300 international researchers to provide an independent,  scientifically based, integrated and policy-relevant analysis of current and emerging energy issues and options. It has  been peer-reviewed anonymously by an additional 200 international experts. The GEA assesses the major global  challenges for sustainable development and their linkages to energy; the technologies and resources available for  providing energy services; future energy systems that address the major challenges; and the policies and other  measures that are needed to realize transformational change toward sustainable energy futures. The GEA goes beyond  existing studies on energy issues by presenting a comprehensive and integrated analysis of energy chalenges,  opportunities and strategies, for developing, industrialized and emerging economies. This volume is a invaluable  resource for energy specialists and technologists in all sectors (academia, industry and government) as well as  policymakers, development economists and practitioners in international organizations and national governments.