With oil running out and the planet heating up, there's a lot of interest in new public transportation systems these days. But some existing...
[youtube]http://www.youtube.com/watch?v=yZbXVSVF9Q4With oil running out and the planet heating up, there's a lot of interest in new public transportation systems these days. But some existing subways already provide billions of rides each year. In this original GOOD Video, we look at the high scores of the world's biggest subway systems.
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