The Milankovic Cycles — Inclination of the Earth's Axis
The position of the Earth's axis affects the Earth's ice cover. With a cycle of about 40,000 years, the Earth's axis tilts up to two degrees more toward the sun. Whenever this happens, there is less ice cover. Author: ZDF/Terra X/ H. Kotarba/ Albrecht M. Wendlandt Translation and Dubbing: alugha