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Over the past 400,000 years, there have been four interglacial periods and four glacial maximums. It takes 80,000 years to transition from an interglacial period to a glacial maximum, but only 10,000 years to come back out of it. The Milankovitch cycle, influenced by the gravity of Jupiter, affects the tilt of the Earth and the shape of its orbit, which in turn impacts temperature. Contrary to Al Gore's claim, CO2 does not cause temperature increase; rather, temperature warming the oceans leads to the release of CO2, while cooling oceans absorb it. The Vostok ice core record shows an 800-year lag between temperature and CO2 changes. Currently, CO2 levels are rising due to human emissions, but it is not causing a corresponding increase in temperature.