Massive ice core is a ‘time machine’ that could help solve an ancient climate mystery, scientists say

Air bubbles within a deep ice core drilled in Antarctica could reveal why Earth suddenly began to experience longer ice ages nearly 1 million years ago.

​ Air bubbles within a deep ice core drilled in Antarctica could reveal why Earth suddenly began to experience longer ice ages nearly 1 million years ago. Read More Breaking News, Latest News and Videos | CNN