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the complex of a community of organisms and its environment functioning as an ecological unit
Energy efficient homes are composed of a network of elements working together to reduce the overall amount of energy consumption.
warming of the surface and lower atmosphere of a planet (as Earth or Venus) that is caused by conversion of solar radiation into heat in a process involving selective transmission of short wave solar radiation by the atmosphere, its absorption by the planet's surface, and reradiation as infrared which is absorbed and partly reradiated back to the surface by atmospheric gases
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