EARTH’S ICE-INDUCING BEHAVIOUR
How changes in the way our planet orbits the Sun can disrupt the seasons and bring about an ice age
1 ECCENTRICITY
Earth’s elliptical pilgrimage around the Sun. Its shape cycles from more to less elliptical every 100,000 years.
2 OBLIQUITY
Otherwise known as Earth’s axis, its obliquity cycles between 22.1 and 24.5 degrees every 41,000 years.