| http://www.w3.org/ns/prov#value | - With methane, nitrous oxide, deforestation and other human impacts, the CO2 equivalency is more like 435 ppm, and that means a 155 ppm increase from pre-industrial levels, when around 100 ppm is the typical swing between the coldest parts of ice ages and the warmest interglacials of the last three million years.
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