Greenhouse effect is a process that occurs when energy from a planet's host star goes through its atmosphere and heats the planet's surface, but greenhouse gases in the atmosphere prevent some of the heat from returning directly to space, resulting in a warmer planet.
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Earth's natural greenhouse effect keeps the planet from having the below freezing temperature that it would have if there were no greenhouse gases.
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Runaway greenhouse effect occurs when greenhouse gases accumulate in the atmosphere through a positive feedback cycle to such an extent that they substantially block thermal radiation from escaping into space, thus preventing the planet from cooling.
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The runaway greenhouse effect occurred with carbon dioxide and water vapor on Venus.
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Term greenhouse effect comes from a flawed analogy to greenhouses, which have transparent glass that passes sunlight but retains heat by physically restricting air movement; radiative effects are not involved.
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The Greenhouse effect was more fully quantified by Svante Arrhenius in 1896, who made the first quantitative prediction of global warming due to a hypothetical doubling of atmospheric carbon dioxide.
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The greenhouse effect is the contribution of greenhouse gases and aerosols to this difference, with imperfect modelling of clouds being the main uncertainty.
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Rather than the surface itself, it is more realistic to think of the greenhouse effect as applying to a layer in the mid-troposphere, which is effectively coupled to the surface by a lapse rate.
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Greenhouse effect gas is a gas capable of trapping solar radiation energy within a planet's atmosphere.
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Greenhouse effect is built of any material that passes sunlight: usually glass or plastic.
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Runaway greenhouse effect occurs if positive feedbacks lead to the evaporation of all greenhouse gases into the atmosphere.
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The net Greenhouse effect of these two phenomena result is a net warming of 21K - 9K = 12K, so Titan is 12 K warmer than it would be if there were no atmosphere.
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