The<unk>  is the process in which the emission of infrared radiation by the atmosphere warms a planet's surface. The name comes from an incorrect analogy with the warming of air inside a<unk>  compared to the air outside the<unk> . The<unk>  was discovered by Joseph Fourier in 1824 and first investigated quantitatively by Svante Arrhenius in 1896.
The Earth's average surface temperature of 14 °C (57 °F) would otherwise be about -19 °C (-2.2 °F) in the absence of the<unk> . Global warming, a recent warming of the Earth's lower atmosphere, is believed to be the result of an enhanced<unk>  due to increased concentrations of<unk>  gases in the atmosphere. In addition to the Earth, Mars and Venus have<unk> s.
Greenhouse effect
Quantum yield
Reaction rate constant
Equation of state
Extraction ratio
Spin quantum number
Absolute deviation
Angular resolution