English subtitles for clip: File:Der Milankovic-Zyklus – Neigung der Erdachse (CC BY 4.0) .webm

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The position of the Earth's axis
affects the ice covering the earth.

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With a cycle of around 40,000 years,

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the Earth's axis tilts up
to two degrees more towards the Sun.

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Whenever this happens,
the ice cover is less.