What’s In a 20,000 Year-Old Cube of Ice?

Like tiny time capsules from 20,000 years ago, the minuscule bubbles trapped within Antarctic ice core samples can tell us the composition of Earth’s ancient atmosphere. Scientists use these bubbles to measure the data over time, and, as paleoclimatologist Dr. Jeffrey Severinghaus explains: …what we’ve learned from that is that … Continue reading What’s In a 20,000 Year-Old Cube of Ice?