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It's Okay to Be Smart
What’s In a 20,000 Year-Old Cube of Ice?
Season 7
Episode 22
Earth’s climate is changing in a big way, and it’s because there's more carbon dioxide in the atmosphere than at any point in our species’ history. But Earth’s climate has changed before. How do we know that this time we’re the cause? We know thanks to tiny bubbles of ancient atmosphere trapped in ice.
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We travel to Great Sand Dunes National Park to climb the largest sand dunes in America.
