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Greenhouse gas emissions increased 70 percent between 1970 and 04 Emissions of carbon dioxide, the most important greenhouse gas, rose by about 80 percent during that time The amount of carbon dioxide in the atmosphere today farIn the context of contributions of different gases to atmospheric warming the concept of global warming potential (GWP) can be useful GWP is a measure of how much energy a greenhouse gas would add to atmospheric warming in a given time compared to CO 2 A molecule's GWP depends on three factors the wavelengths where the molecule absorbsThere are many greenhouse gases but these are some of the most important water vapour, H2O carbon dioxide, CO2 methane, CH4 nitrous oxide, N2O CFCs (chlorofluorocarbons) Climate Change Basics Ag Matters Greenhouse gas diagram simple