greenhouse effect

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greenhouse effect

Planetary warming as a result of the trapping of solar energy beneath atmospheric gases. The composition and concentration of the gases in the atmosphere influence the earth's surface temperature because some gases more effectively retain heat than others. Fossil fuel combustion, which has increased at a rapid rate since the 1950s, has deposited increasing amounts of carbon dioxide in the upper atmosphere. This is thought to be a contributory factor in global warming, a phenomenon suspected of having widespread effects on all ecosystems. See: global warming; ozone

greenhouse effect

The progressive earth-heating effect resulting from the transparency of the atmosphere to sun (solar) radiation at high frequencies and its relative opacity to energy re-radiated by the earth at a lower, less penetrative, frequency. Water vapour and carbon dioxide are the main elements concerned, and any increase in these, mainly from the burning of fossil fuels, enhances the heating effect. A rise in surface temperature could melt polar ice and cause widespread flooding.

greenhouse effect

  1. an effect occurring in greenhouses in which the glass transmits short wavelengths but absorbs and re-radiates longer wavelengths, thus heating the interior.
  2. the application of this effect to the earth's atmosphere. Infrared radiation tends to be trapped by carbon dioxide and water vapour in the earth's atmosphere and some of it is re-radiated back to the earth's surface.
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A "(https://www.nasa.gov/centers/ames/news/releases/2002/02_60AR.html) runaway greenhouse " happens when a planet takes in more energy from the sun than it can expel which results in the surface of the planet warming, which speeds up the warming process further.
The snowball Earth and the runaway greenhouse effect on Venus are examples of such possible instabilities.
In the runaway greenhouse stage, a planet absorbs more solar energy than it can give off to retain equilibrium.
A release of all gas hydrates would see more than 200 times the current amount of carbon dioxide escape into the atmosphere leading to a 'runaway greenhouse effect'.
A recent study found that Venus once had a climate similar to Earth's; after about 2 billion years, however, a runaway greenhouse effect led to the planet's current inhospitable environment.
Sagan said that Venus, being closer to the sun than Earth might have suffered from a runaway greenhouse effect.
The carbon dioxide produces a runaway greenhouse effect that makes Venus the hottest planet in the Solar System, hotter even than Mercury.
That having been said, there is no evidence that Earth can experience a runaway greenhouse effect like Venus did, which literally evaporated its oceans.
It might take a billion years or so to complete the process, but the runaway greenhouse effect on the planet would turn it into a hellscape, with temperatures of up to 1,000C.
Astrobiologists have until now thought water was a potential oxygen source only on planets such as Venus, where a runaway greenhouse effect drove temperatures to spiral higher and higher, eventually boiling away the oceans.