Researchers have found evidence of a giant river system under the Antarctic ice, according to a new study. A recent research article published in Science Advances covers the process by which the authors concluded that a giant river system existed in Antarctica during the middle-to-late Eocene period. One of the objectives of the study was to understand how climate change has impacted the world across the decades, Live Science reported. During the middle-to-late Eocene period, Earth’s atmosphere changed drastically. Carbon dioxide dropped sharply leading to the formation of glaciers on an ice-f…