Guardian: The time capsule is ice that froze 1.5m years ago, capturing tiny bubbles of air, bringing a sample of the ancient atmosphere through time to the present day.
There are already dozens of ice cores from Antarctica and Greenland. They are tubes of ice, sometimes several kilometres long, drilled from the ice sheet, which reveal a timeline of what the atmosphere was like over hundreds of millennia.
Together those cores paint a detailed picture of the history of our atmosphere and climate. Theyve...