▪ Abstract Water vapor is the dominant greenhouse gas, the most important gaseous source
of infrared opacity in the atmosphere. As the concentrations of other greenhouse gases,
particularly carbon dioxide, increase because of human activity, it is centrally important to
predict how the water vapor distribution will be affected. To the extent that water vapor
concentrations increase in a warmer world, the climatic effects of the other greenhouse
gases will be amplified. Models of the Earth's climate indicate that this is an important�…