Abstract is: The 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. Earth's natural greenhouse effect keeps the planet from having the below freezing temperature that it would have if there were no greenhouse gases. Additionally, human-caused increases in greenhouse gases trap greater amounts of heat, causing the Earth to grow warmer over time. Anything radiates energy related to its temperature: the Sun—at about 5,500 °C (9,930 °F)—sends most of its energy as visible and near infrared light, while Earth's average surface temperature—at about 15 °C (59 °F)—emits longer-wavelength infrared, radiant heat. The atmosphere is transparent to most incoming sunlight, and allows its energy through to heat the surface. Most gases in the atmosphere are transparent to infrared, but the small proportion of the atmosphere that constitutes greenhouse gases absorbs some of the heat emitted by the surface rather than letting it escape into space. These greenhouse gas molecules then emit radiant heat in all directions, passing heat to the surrounding air and warming other greenhouse gas molecules. Radiant heat going downwards further increases the temperature of the surface, which then returns heat to the atmosphere in a positive feedback cycle. Without Earth's natural greenhouse effect the Earth would be more than 30 °C (54 °F) colder. A 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 (heat) from escaping into space, thus preventing the planet from cooling. The runaway greenhouse effect occurred with carbon dioxide and water vapor on Venus. It is unlikely that human-caused greenhouse gas emissions alone could trigger a runaway effect on Earth. The 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.
| meteorology | Q25261 |
| meteorological phenomenon | Q16332653 |
| P1542 | has effect | climate change | Q7942 |
| P138 | named after | greenhouse | Q165044 |
| P5008 | on focus list of Wikimedia project | WikiProject Climate change | Q15305047 |
| P461 | opposite of | anti-greenhouse effect | Q2639439 |
| P910 | topic's main category | Category:Greenhouse effect | Q9149492 |
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| Q1243582 | Qo'noS | has characteristic | P1552 |
| Q4357041 | runaway greenhouse effect | subclass of | P279 |
| Q9149492 | Category:Greenhouse effect | category's main topic | P301 |
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