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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 netwok of elements working together to reduce the overall amount of energy consumption
fuels (as coal,oil,or natural gas) formed in the earth from plant or animal remains
greenhouse effect (noun)
warming of the surface and lower atmospher 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 rera diated back to the surface by atmospheri gases
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