Arctic Sinkholes I Full Documentary I NOVA I PBS

In the Arctic, enormous releases of methane, a potent greenhouse gas, threaten the climate. Colossal explosions shake a remote corner of the Siberian tundra, leaving behind massive sinkholes. In Alaska, a huge... Read more »

What Does the Atmosphere Do? Crash Course Geography #6

Much like a cell membrane, our atmosphere forms a protective boundary between outer space and the biosphere that allows for all life to exist on Earth’s surface. Today, we’re going to talk... Read more »
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