Green Living Glossary: A

acid rain : A mild acidic solution that falls in rain or as dry particles caused when fossil fuel burning produces sulfur dioxide and nitrogen oxides. Acid rain has been linked to damaging effects on waterways and forests.

active solar design : A strategy for designing high-performance, ultra-energy-efficient buildings. Active solar incorporates all the elements of a passive solar design with additional mechanical equipment, such as pumps or fans, to take advantage of the heat from the sun.

alternative energy sources : Wind, hydro (water), biomass (fuel from natural material such as crops and agricultural waste), and solar power.

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