Each book in ENERGY FOR THE FUTURE AND GLOBAL WARMING explores key concepts and issues related to energy availability, production, and use and explains the impact of energy use on global climate. The eight volumes feature easy-to-read text accessible to a wide range of students, vivid photos, and clear, easy-to-understand illustrations and diagrams. This series will serve as a comprehensive and indispensable resource for anyone interested in the energy prospects for our future needs. Earth produces a constant supply of clean heat energy, but not everyone can use it. In Geothermal Energy, readers will discover which locations on Earth use this free energy source and how scientists are working to make it more widely available.