| http://www.w3.org/ns/prov#value | - In 2004, the global measurements of all the long-lived greenhouse gases, including carbon dioxide, methane, nitrous oxide, the chlorofluorocarbons, and ten minor halogen gases were condensed into a simple index, the Annual Greenhouse Gas Index (AGGI) by summing their radiative climate forcing since the pre-industrial era (taken as 1750).
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