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How Do We Know: Salty Seas Watch Video

How Do We Know: Salty Seas

Ocean salinity can have a big impact when it comes to changing climate. Learn how scientists are monitoring our salty seas.

How Do We Know: Proof in the Pixels Watch Video

How Do We Know: Proof in the Pixels

Dr. Heidi Cullen talks to Dr. John Townshend about his current research which tracks rainforest deforestation.

How Do We Know: Ocean Acidification Watch Video

How Do We Know: Ocean Acidification

The atmosphere isn't the only place carbon dioxide caused by human activity goes.

How Do We Know: Sea Level Rise Watch Video

How Do We Know: Sea Level Rise

A warming planet could mean that sea levels rise three or more feet by the end of this century.

How Do We Know: Greenland’s Melting Ice Sheet Watch Video

How Do We Know: Greenland’s Melting Ice Sheet

Climate change is turning a lot of Greenland's ice to water. But, how do we know?

NEEM: Ice Cores Tell of Climate History Watch Video

NEEM: Ice Cores Tell of Climate History

Dr. Jørgen Peder Steffensen explained the goals of the North Greenland Eemian Ice Drilling project and what the ice cores can tell us about our climate history.

Wind Energy Watch Video

Wind Energy

Why do we get less than 2 percent of our energy from wind?

What Does Nuclear Power Cost? Watch Video

What Does Nuclear Power Cost?

We don't know what it will cost to build the next nuclear power plant in the U.S.