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| Rain made artificially acidic by pollutants, particularly oxides of sulfur and nitrogen; natural rainwater is slightly acidic owing to the effect of carbon dioxide dissolved in the water. |
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| Refers to the energy sources that are alternative to the commonly used fossil fuels. |
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| A number of fuels including ethanol(alcohol), derived from plants |
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| A sedimentary rock formed from plant material that has been buried, compressed, and changed. |
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| Methane stored on surfaces of organic matter in coal. |
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| With respect to energy resources, the recycling of waste heat to increase the efficiency of a typical power plant or factory; may involve production of electricity as a by-product from industrial processes. |
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| Policy for resources such as water and energy that moderates or adjusts demands in order to minimize expenditure of the resource; may mean getting by with less through improved technology to provide just the amount of the resource necessary for a given task. |
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| with respect to energy resources, refers to designing and using equipment that yields more power from a given amount of energy, resulting in wasting less of the energy to the environment as heat. |
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| Fuels such as coal, oil, and gas formed by the alteration and decomposition of plants and animals from a previous geologic time. |
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| A device that produces electricity directly from a chemical reaction; commonly uses hydrogen as a fuel to which an oxident is supplied. |
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| The useful conservation of natural heat from the interior of Earth. |
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| From an environmental energy perspective, refers to less of large centralized power plants; maybe coupled with energy conservation and cogeneration. |
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| Sometimes also referred to as natural energy gas or hydrocarbons that include ethane, propane, butane, and hydrogen. |
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| Generation of electricity using a nuclear reactor |
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| When referring to energy resources, may also be known as petroleum or crude oil; a liquid hydrocarbon generally extracted from wells. |
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| The time when half of all oil on Earth will have been extracted. |
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| with respect to energy resources, refers to development of an energy policy that involve alternatives that are renewable, flexible, decentralized, and(to some people) more benign from an environmental viewpoint than the hard path. |
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| Energy that is collected from the sun |
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| Sustainable Energy Policy |
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| Development of energy policy that finds useful sources of energy that do not have adverse environmental effects or minimizes those effects in such a way that future generations will have access to energy resources and a quality environment. |
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| with respect to energy resources, refers to the useful conversion of tidal currents to produce electrical power. |
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| use of flowing water such as in a reservoir to produce electrical power |
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| Technology (mostly windmills) used to extract electrical energy from the wind. |
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