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Definition Of:

Water Vapor

EPA Glossary of Climate Change Terms

The most abundant greenhouse gas; it is the water present in the atmosphere in gaseous form. Water vapor is an important part of the natural greenhouse effect. While humans are not significantly increasing its concentration, it contributes to the enhanced greenhouse effect because the warming influence of greenhouse gases leads to a positive water vapor feedback. In addition to its role as a natural greenhouse gas, water vapor plays an important role in regulating the temperature of the planet because clouds form when excess water vapor in the atmosphere condenses to form ice and water droplets and precipitation. See greenhouse gas.

Provided as a public service by the U.S. Environmental Protection Agency. Reference list click here.

EPA Glossary of Climate Change Terms INDEX:

List of Terms: Terms beginning with "A", Page 1

A B C D E F G H I J K L M N O P Q R S T U V W

1 2 3

A: Page 1 of 3.

Abiotic	Absorption of ra...	Acid deposition
Acid rain	Acid Solution	Acidic
Adiabatic Process	Aerobic	Aerosol
Afforestations	Air carrier	Air pollutant

Other Resources

Earth911.org Environmental Glossary

INforEEP Environmental Glossary

NRDC Glossary of Environmental Terms

ESC Glossary

U.S. Environmental Protection Agency

United Nations Environment Programme

European Environment Agency

Greenpeace

World Wildlife Fund

GreenNet

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