Radiative forcing can be a useful way to evaluate multiple perturbations to a climate system over time. The table and figures below (derived by researchers at NOAA from atmospheric radiative transfer models) shows changes since year 1979 in the radiative forcing of the long-lived and well-mixed greenhouse gases that have been rapidly increasing in earth's atmosphere since the industrial revolution. The table includes the direct forcing contributions from carbon dioxide (), methane (), nitrous oxide (); chlorofluorocarbons (CFCs) 12 and 11; and fifteen other halogenated gases. These data do not include the significant forcing contributions from shorter-lived and less-well-mixed gases or aerosols; including those indirect forcings from the decay of methane and some halogens. They also do not account for changes in land or solar activity.