The sample provides clues to Antarctica's ancient history and the planet's future. With the help of an ice core that was taken from the Antarctic and dated to about five million years ago, scientists may now examine the planet's prehistoric atmosphere. The study's authors say that the ice in the sample comes from the Pliocene epoch, when temperatures and carbon dioxide … [Read more...] about Sample Of Earth’s Ancient Atmosphere Found In Five-Million-Year-Old Antarctic Ice Core