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The Milankovitch cycle

describes the collective effects of changes in the Earth's movements upon its climate[.]

By this theory, the Earth is now experiencing an interglacial.

By the theory, when will the interglacial end and the next ice age begin?

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This paper seems to be discussing what you've asked: The next ice age is expected to begin about 50,000 years from now. However, I think it's still debatable how accurate the predictions of Milankovitch cycles are, and how much of an effect humans are likely to have on this earth system.

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Your link requires paid membership :( – Joan.bdm Jul 1 '14 at 14:59
Try one of the links here:… – Takku Jul 1 '14 at 15:39

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