Increased concentrations of carbon dioxide and methane in the atmosphere lead to slight increases in atmospheric temperature, but the main factor is water in the form of [[water vapor]] and [[cloud cover]].
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Going back thousands of centuries into the past, variations in global air temperature are closely associated with corresponding changes in carbon dioxide levels. Scientists generally believe that temperature drives carbon dioxide{{fact}}, although some have called the data ambiguous. [http://www.daviesand.com/Choices/Precautionary_Planning/New_Data/ Davies and Company]
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Historically, variations in global air temperature have been followed centuries later by corresponding changes in carbon dioxide levels. Thus, temperature drives carbon dioxide.
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Increased concentrations of carbon dioxide and methane in the atmosphere lead to slight increases in atmospheric temperature, but the main factor is water in the form of [[water vapor]] and [[cloud cover]].