This from Wikipedia 4] Role in greenhouse effect[edit] The...

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    4]
    Role in greenhouse effect[edit]

    The reduction of the surface long-wave radiative flux drives the greenhouse effect.[7] Greenhouse gases, such as methane(CH4), nitrous oxide (N2O), water vapor (H2O) and carbon dioxide (CO2), absorb certain wavelengths of OLR, preventing the thermal radiation from reaching space, adding heat to the atmosphere. Some of this thermal radiation is directed back towards the Earth by scattering, increasing the average temperature of the Earth's surface. Therefore, an increase in the concentration of a greenhouse gas may contribute to global warming by increasing the amount of radiation that is absorbed and emitted by these atmospheric constituents. If the absorptivity of the gas is high and the gas is present in a high enough concentration, the absorption bandwidth becomes saturated. In this case, there is enough gas present to completely absorb the radiated energy in the absorption bandwidth before the upper atmosphere is reached, and adding a higher concentration of this gas will have no additional effect on the energy budget of the atmosphere.
    The OLR is dependent on the temperature of the radiating body. It is affected by the Earth's skin temperature, skin surface emissivity, atmospheric temperature, water vapor profile, and cloud cover.[3]

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