Definitions for "Greenhouse Gas"
Some gases, such as carbon dioxide, methane, and nitrous oxide, trap heat in the atmosphere by allowing sunlight to pass through while trapping the heat. Fossil fuels burned to produce electricity contribute 2/3 of these gases found in our atmosphere.
Gases such as carbon dioxide, methane, and water vapor that produce a greenhouse effect.
Any gas that absorbs infra-red radiation in the atmosphere. Greenhouse gases include water vapor, carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), halogenated fluorocarbons (HCFCs) , ozone (O3), perfluorinated carbons (PFCs), and hydrofluorocarbons (HFCs).