NOVA

How Earth’s Climate Changed Over the Past 500 Million Years

Clip: Season 47 Episode 1 | 3m 25s Video has closed captioning.

Over its history, Earth has fluctuated between two climate states: Icehouses, with ice caps at at least one of the poles, and Hothouses, when there is no ice at the poles.

Aired: 02/05/20

Rating: NR

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Problems Playing Video? | Closed Captioning

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Parenting is full of obstacles that can be hard to navigate—even without a toddler yelling at your face. There’s no instruction manual, which means discerning fact from fiction and reasonable from ridiculous can be maddening. That’s where Parentalogic comes in, a digital series from NOVA and PBS Digital Studios.

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