An original contribution to our understanding of a phenomenon that is reshaping the world, this title thoroughly discusses the transformation of the energy security policy arena brought on by two dramatic developments - the increased potential availability of energy in many parts of the world on the supply side, and on the demand side increasing concerns over the harmful effects on the environment brought on by the use of fossil fuels. An in depth discussion specifically focuses on what energy security means to different countries, and examines which of those countries appear to be managing their energy/climate transitions successfully and which are having a more difficult time adapting to the new environment. 　 Part 1 introduces the topic, covering the main themes and provides an overview of the chapters Part 2 provides a framework for policy evaluation, considering the evolving factors affecting energy security and the energy/climate policy trilemma Parts 3 to 6 discuss energy transitions in the carbon producing countries (Saudi Arabia, Canada, Iran, Russia, Mexico), in intermediate carbon/producing/consuming countries (China, United States, UK, Brazil, Argentina, South Africa), in carbon consuming countries (Germany, Japan, South Korea, Israel, India, Spain) and finally in carbon reduction countries (France, Denmark, Switzerland) Part 7 looks at attempts at regional/international cooperation Part 8 considers the prospects for the future, examining technological breakthroughs.   This title builds on the theme of unfolding energy transformations driven by, but increasingly constrained by climate/environmental considerations. It is ideal for researchers and students in the areas of environmental politics and policy, climate change, and energy and climate security, as well as for academics and professionals.