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Acid rain
Any precipitation that is more acidic than normal. Most commonly caused by sulfur dioxide released from the smokestacks of coal-burning power plants and other industrial sources, acid rain damages buildings, aquatic plants and animals and forests and may be harmful to the health of human beings.
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Alternative energy
Energy that is sourced and fueled in ways that does not consume exhaustible natural resources or bring harm to the environment, e.g., solar, hydroelectric, wind, wave and tidal energy.
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