Report Abuse. An Ice Age (and there was more than one) affects the climate of the entire Earth. Ice doesn't cover the entire Earth during an Ice Age, but where it doesn't, the climate is cooler than in a non-ice-age period. There have also been times in Earth's history when the entire planet was covered in ice.These periods are known as Snowball Earth periods.ce doesn't cover the entire Earth during an Ice Age, but where it doesn't, the climate is cooler than in a non-ice-age period. There have also been times in Earth's history when the entire planet was covered in ice.