[Answer] Which of the following contributes to the greenhouse effect?

Answer: Chlorofluorocarbon accumulation in the atmosphere
Which of the following contributes to the greenhouse effect?

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 mainly of carbon dioxide. “Venus experienced a runaway greenhouse in the past and we expect that Earth will in about 2 billion …

The contribution of each gas to the greenhouse effect is determined by the characteristics of that gas its abundance and any indirect effects it may cause. For example the direct radiative effect of a mass of methane is about 84 times stronger than the same mass of carbon dioxide over a 20-year time frame but it is present in much smaller concentrations so that its total direct radiative effect has so far been smaller in part due to its shorter atmospheric lifetime in the absence of additional carbon sequestration. On the other hand in addition to its direct radiative impact methane has a large indirect radiative effe…

The contribution of each gas to the greenhouse effect is determined by the characteristics of that gas its abundance and any indirect effects it may cause. For example the direct radiative effect of a mass of methane is about 84 times stronger than the same mass of carbon dioxide over a 20-year time frame but it is present in much smaller concentrations so that its total direct radiative effect has so far been smaller in part due to its shorter atmospheric lifetime in the absence of additional carbon sequestration. On the other hand in addition to its direct radiative impact methane has a large indirect radiative effect because it contributes to ozone formation. Shindell et al. (2005) argues that the contribution to climate change from methane is at least double previous estimates as a result of this effect. When ranked by their direct contribution to the greenhouse effect the most important are: In addition to the main greenhouse gases listed above other greenhouse gases include sulfur hexafluoride hydrofluorocarbons and perfluorocarbons (see IPCC list of greenhouse gases). Some greenhouse gases are not often listed. For example nitrogen trifluoride has a high global warming potential (GWP) but is only present in very small quantities. It is not possible to state that a certain gas causes an exact percentage of the greenhouse effect. This is because some of the gases absorb and emit radiation at the same frequencies as others so that the total greenhouse effect is not simply the sum of the influence of each gas. The higher ends of the ranges quoted are for each gas alone; the lower ends account for overlaps with the other gases. In addition some gases such as methane are known to have large indirect effects that are still being quantified. Aside from water vapor which has a residence timeof about nine days major greenhouse gases are well mixed and take many years to leave the atmosphere. Although it is not easy to know with precision ho…

Greenhouse effect – definition of greenhouse effe…

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