Or
Enter your email address and we'll send you a link to reset your password.
To view this video please enable JavaScript, and consider upgrading to the latest web browser
A look at past Ice Age eras that Earth has experienced throughout its existence; how the slightest changes in the planet's orbit and angle of rotation can bring them about; how long they can last, and when the Earth will endure another.
Our movie and video library can only be streamed or downloaded by members only