Greenhouse Gas

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A greenhouse gas is one which contributes to the greenhouse effect. Greenhouse gases are the most commonly considered factors in global warming.

Water vapor is the primary greenhouse gas, accounting for most of the greenhouse effect. In public policy discussions, however, water vapor is generally disregarded.

Other greenhouse gases include carbon dioxide, methane, nitrous oxide and chlorinated fluorocarbons (CFCs) such as freon. Carbon dioxide is the subject of a proposed global warming treaty (see Kyoto Protocol).

Since the beginning of the Industrial Revolution, the concentrations of many of the greenhouse gases have increased. Carbon dioxide is up 30%, methane over 50%, nitrous oxide 15%. Scientists agree that the increased concentration of greenhouse gases is caused by human activity, primarily the burning of fossil fuels.

As the concentrations of greenhouse gases in the atmosphere increases, some scientists believe, the temperature will increase, leading to harmful global warming. Other scientists believe that the global warming seen since the late 19th century is a natural recovery from the Little Ice Age.
See: global warming controversy, environmental agreements