Will Sci-Fi Save Us?

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A still from <i>SimCity: Cities of Tomorrow</i>.
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What does today’s sci-fi mean for our real-life future?  Cyberpunk author Neal Stephenson argues that it’s time to get over our love of dystopia. A class at MIT searches sci-fi classics for technologies they can invent right now, although maybe they shouldn’t. Geoengineers take a tip from Carl Sagan – who saw a green future for Mars – to see if we can save Earth.  And we meet some scientists who think that if we ever want to see the stars, we’d better start building the starship.