Renewable fuels, such as wind, solar, biomass, tides, and geothermal, are inexhaustible, indigenous and are often free. They need to be captured efficiently and transformed into electricity, hydrogen or clean transportation fuels to provide the energy of the future. This book addresses how to approach and apply technology, economics and policy to bring down the costs involved with renewables, the most important challenge faced in the green era. It is intended for students and professionals in resources, energy and environmental engineering and in economic fields focusing on green energy.