'Cosmos' recap: Climate change is explained in 'The World Set Free'

June 2, 2014 12:31 PM

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Is it getting hot in here? In what is likely to prove one of its most controversial episodes yet, this week's "Cosmos" lays out the powerful scientific case for climate change, framed within a tale of two planets: Venus and Earth.

Venus was not much different from Earth back in the earliest days of the solar system, with vast oceans and an atmosphere potentially friendly to life. Visit Venus today, however, and you'll find that its once abundant oceans have long since evaporated away because of the broiling temperatures -- ho...

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