Energy is the lifeblood of modern economies. Everything we do requires energy. By 2050 around 10 billion people will be living on this planet. Energy requirements will increase manifold. Expanding reliable and affordable supplies of energy will support industry, modern agriculture, increased trade, improved transportation, expanded communications, health, cutting-edge medical equipments and procedures and much more. These are building blocks of economic growth that create jobs that help people escape poverty and create better lives for their children. For these reasons and more, energy issues are vitally important and demand our understanding.