The gas that is thought to be responsible for more than half of the anthropogenic warming of the atmosphere is

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Carbon dioxide is the gas that is responsible for more than half of the anthropogenic warming of the atmosphere. While methane and CFCs are also potent greenhouse gases, their concentrations in the atmosphere are much lower than carbon dioxide. Water vapor is also a greenhouse gas, but its concentration in the atmosphere is largely controlled by the temperature, rather than human activities. Ozone is a minor greenhouse gas and its contribution to anthropogenic warming is much smaller than carbon dioxide.

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