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A runaway greenhouse effect occurs if positive feedbacks lead to the evaporation of all greenhouse gases into the atmosphere.[39] A runaway greenhouse effect involving carbon dioxide and water vapor has long ago been hypothesized to have occurred on Venus,[40] this idea is still largely accepted[citation needed].

Bodies other than Earth

The 'greenhouse effect' on Venus is particularly large for several reasons:

  1. It is nearer to the Sun than Earth by about 30%.
  2. Its very dense atmosphere consists

    The 'greenhouse effect' on Venus is particularly large for several reasons:

    1. It is nearer to the Sun than Earth by about 30%.
    2. Its very dense atmosphere con

      "Venus experienced a runaway greenhouse in the past, and we expect that Earth will in about 2 billion years as solar luminosity increases".[42]

      Titan is a body with both a greenhouse effect and an anti-greenhouse effect. The presence of anti-greenhouse effect. The presence of N2, CH4, and H2 in the atmosphere contribute to a greenhouse effect, increasing the surface temperature by 21K over the expected temperature of the body with no atmosphere. The existence of a high-altitude haze, which absorbs wavelengths of solar radiation but is transparent to infrared, contribute to an anti-greenhouse effect of approximately 9K. The net 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.[43][44]