Answer: Carbon dioxide
Notes: The overall contribution of greenhouse gases to global warming depends on their atmospheric lifetime as well as their ability to trap radiation. Each ton of Chlorofluorocarbon emissions is about 5,750 times more efficient at trapping heat than each ton of CO2. The comparatively greater amount of CO2 in the atmosphere, however, means that it accounts for roughly half of the radiative forcing associated with the greenhouse effect. So, it contributes the maximum to the phenomena of global warming.
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