The GWP of carbon dioxide (CO2) is a measure of its ability to trap heat in the atmosphere over a specific period, usually 100 years, relative to other greenhouse gases. CO2 is the most abundant greenhouse gas and has a GWP of 1, meaning that it is used as the baseline for comparing the warming potential of other gases. Other greenhouse gases, such as methane and chlorofluorocarbons, have higher GWPs than CO2, meaning that they have a greater warming effect on the Earth's atmosphere.