Extras

Video thumbnail: NOVA Plant Fossils Hint at Arctic's Swampy Past

NOVA

Plant Fossils Hint at Arctic's Swampy Past

Learn more about a lush forest that once dominated the Arctic.

Plant Fossils Hint at Arctic's Swampy Past

Video thumbnail: NOVA How Carbon Dioxide Warms Planet Earth

NOVA

How Carbon Dioxide Warms Planet Earth

Carbon dioxide acts like a heat-trapping blanket, warming our planet.

How Carbon Dioxide Warms Planet Earth

Video thumbnail: NOVA What’s Causing Greenland’s Biggest Glacier to Melt?

NOVA

What’s Causing Greenland’s Biggest Glacier to Melt?

Warming ocean water is eating away at Greenland's glaciers from below.

What’s Causing Greenland’s Biggest Glacier to Melt?

Video thumbnail: NOVA Fifty Million Years Ago, the Arctic Was a Warm Swamp

NOVA

Fifty Million Years Ago, the Arctic Was a Warm Swamp

Drop yourself into a modern-day swamp, and that's what the ancient Arctic looked like.

Fifty Million Years Ago, the Arctic Was a Warm Swamp

Video thumbnail: NOVA Why Trees Are Living Climate Records

NOVA

Why Trees Are Living Climate Records

Trees have an environmental record etched into their very wood.

Why Trees Are Living Climate Records