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|Noun||1.||greenhouse emission - a gas that contributes to the greenhouse effect by absorbing infrared radiation|
CFC, chlorofluorocarbon - a fluorocarbon with chlorine; formerly used as a refrigerant and as a propellant in aerosol cans; "the chlorine in CFCs causes depletion of atmospheric ozone"
carbon dioxide, carbonic acid gas, CO2 - a heavy odorless colorless gas formed during respiration and by the decomposition of organic substances; absorbed from the air by plants in photosynthesis
gas - a fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely