CO2 is the most important radiative forcing behind global warming because it is the most abundant of all the greenhouse gases in the atmosphere and its residence time in the atmosphere is very long.
This allows it to accumulate and persist over a long period of time, and so its radiative forcing effect is greater than other greenhouse gases with a lower global warming potential and a shorter residence time.
While other greenhouse gases, such as methane and nitrous oxide, have a greater warming potential, they are present in much smaller quantities in the atmosphere than CO2.
Furthermore, CO2 emissions have been increasing steadily due to human activities such as burning fossil fuels and deforestation, leading to a buildup of CO2 in the atmosphere over time
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