Access to energy is perhaps the modern world's most fundamental challenge. It is a central part of our struggle to save the environment and create a more sustainable world. It is also the basis for political conflicts and wars. Unsustainable energy sources are running out or being phased out. Nuclear power is still very important to many societies, but often controversial. New and greener energy sources are gathering momentum, though not without their own problems and challenges. How can we meet the global need for power and energy efficiency in the future? What are the most interesting technologies, projects and policies? How will the quest for energy affect the political and economic landscape?