About 700 million years ago, Earth was entombed in a veneer of ice hundreds of feet thick—a frozen state scientists refer to as “Snowball Earth.” Oceans cooled but managed to retain some heat to avoid ...

This video examines a moment in Earth’s history when environmental change occurred far faster than expected. Geological and ...

Researchers find that shifts in Earth’s orbit can trigger abrupt climate changes, even in warm periods without ice sheets.

A massive meteorite strike 3.5 billion years ago left behind the world’s oldest known impact crater, challenging previous ...

Our species likes it cold. Homo sapiens evolved in — and still inhabits — one of Earth’s rare and fragile ice ages, periods distinguished not by an abundance of saber-toothed cats and woolly mammoths ...