Energy: Technology and Directions for the Future presents the fundamentals of energy for scientists and engineers. It is a survey of energy sources that will be available for use in the 21st century energy mix. The reader will learn about the history and science of several energy sources as well as the technology and social significance of energy. Themes in the book include thermodynamics, electricity distribution, geothermal energy, fossil fuels, solar energy, nuclear energy, alternate energy (wind, water, biomass), energy and society, energy and the environment, sustainable development, the hydrogen economy, and energy forecasting. Energy: Technology and Directions for the Future presents the fundamentals of energy for scientists and engineers. It recognizes that society's dependence on fossil energy in the early twenty-first century is in a state of transition to a broader energy mix. Forecasts of the twenty-first-century energy mix show that a range of scenarios is possible.