First, what is an ice age? It’s when the Earth has cold temperatures for a long time – millions to tens of millions of years – that lead to ice sheets and glaciers covering large areas of its surface.

Hundreds of millions of Americans are presently besieged by a massive arctic blast and winter storm. Luckily for them, it will only be temporary. That wasn't the case 20,000 years ago... Between ...

The results suggest these hunter-gatherers persisted and adapted to a warming world, rather than being quickly replaced by ...

For decades, scientists puzzled over two key climate mysteries. What sparked the formation of Earth’s vast ice sheets during the last ice age—and how did they spread so fast? New research may finally ...

Earth has experienced several climate cycles throughout its long history, including several ice ages that caused the planet to freeze over. The last ice age occurred approximately 11,700 years ago, ...

A group of scientists think they can now predict when the next ice age could grip Earth, but don't worry, it's not for a very long time. An ice age should begin in about 10,000 years, but its onset is ...

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Two studies published in Nature report that domestic dogs lived alongside Ice Age hunter-gatherers across western Eurasia as ...

This piece is part of a special project on deep time examining what the Western U.S. was like thousands, millions and even billions of years ago, and how that history is still visible and ...