Earth's Ice Ages (image) University of California - Berkeley Share Print E-Mail Caption Over most of the last billion years, Earth has had little to no ice (white regions). However, ice has extended from the poles southward at least seven times (blue), including today, and twice covered nearly all of the planet. Credit Nicholas Swanson-Hysell, UC Berkeley Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.