| http://www.w3.org/ns/prov#value | - (2) ???The cause of this increase is ??? ??? The attribution of all warming after 1950 to CO2 is a theory, one which cannot explain previous warm periods like the Roman Warm Period or the Medieval Warm period or even the exceptional warmth of the 1930s. ??? ??? The most important of these greenhouse gases is carbon dioxide ??? ??? Not true, the most important greenhouse gas is water vapor.
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