This book emerges from the recognition that energy, environment and ecosystems are dynamically and inextricably connected. The energy environment system must be addressed in its totality, so that we can devise sustainable solutions that incorporate both economic growth and environmental conservation. No single clean energy source will sustain long-term energy security, and fossil fuels will remain prominent in the mix of energy sources for several decades to come. Energy solutions, therefore, must employ a broad and diverse range of approaches, including cleaner fossil fuel technologies, and an affordable transition to greener power generation employing waste, water and renewable resources. Moreover, adapting to this changing global energy picture will require a transformational shift in the ways we use and deliver energy services. The authors begin with a broad introductory chapter on sustainable energy and the environment, classifying energy resources,cataloging environmental degradations, and outlining the concepts and practices of sustainability. In Chapters Two and Three, they summarize the basic constituents of the environment, the biosphere and its natural cycles, and offer a model of Earths planetary temperatures and the greenhouse effect. Chapters Four and Five outline conventional energy and power systems, and related environmental degradations. The next several chapters cover clean coal technologies for power generation, and discuss sustainable energy and power technologies based on both thermal and photovoltaic solar energy, along with biomass and wind. The final chapters examine in depth the management of waste and water, pollution control and energy conservation. The book introduces a unique approach to sustainability and energy conservation which emphasizes the relationships between underlying scientific principles and practical applications employed in engineering solutions. All this isoffered in a form that matches the requirements of college-level environmental science and engineering courses.