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| Keywords: Vostok 420ky 4curves insolation.jpg graph 420 000 years of ice core data from Vostok Antarctica research station Current period preindustrial is at left http //cdiac ornl gov/ftp/trends/co2/lawdome smoothed yr20 Source From bottom to top Solar variation at 65°N due to en Milankovitch cycles connected to <sup>18</sup>O <sup>18</sup>O isotope of oxygen Levels of methane CH<sub>4</sub> Relative temperature Levels of carbon dioxide CO<sub>2</sub> From top to bottom Levels of carbon dioxide CO<sub>2</sub> Relative temperature Levels of methane CH<sub>4</sub> <sup>18</sup>O isotope of oxygen Solar variation at 65°N due to en Milankovitch cycles connected to <sup>18</sup>O PD-USGov source http //www usgcrp gov/usgcrp/images/Vostok jpg J R Petit et al Climate and atmospheric history of the past 420 000 years from the Vostok ice core Antarctica Nature 399 429-436 1999 derivative works Vostok 420ky 4curves insolation to 2004 jpg Vostok Station | ||||
