This unique addition to reference literature provides an introduction to the major concepts and contemporary issues that are essential for students of environmental science and environmental studies to know. With over 200 entries authored by world-class names like Anthony Brazel, John Day and Edward Keller, this text is divided into six sections: Environmental Science, Environments, Paradigms & Concepts, Processes & Dynamics, Scales & Techniques, and Environmental Issues.
Renewable energy means garnering useful energy from existing flows, from ongoing natural processes, such as sunshine, wind, flowing water (hydropower), biological processes (such as anaerobic digestion), and geothermal heat flow. A common definition is that renewable energy is from an energy resource that is replaced by a natural process at a rate that is equal to or faster than the rate at which that resource is being consumed. For example, solar photovoltaic technology harvests energy from the Sun, but only a fraction of the total amount of solar energy is harvested. It is a subset of sustainable energy. Most renewable forms of energy, other than geothermal and tidal power, generally come from the Sun. Some forms are stored solar energy such as ...