It's a safe bet that even if there were no pressure to reduce greenhouse gas-related emissions from buildings, today's efficiency ethos and sheer economic self-interest would drive interest in cutting building energy use.

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In Sacramento, Stanford University's self-driving car hit 120 mph in a test drive, and in Ann Arbor, Mich.

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While self-drive cars are limited by law across the U.S., they are allowed with restrictions in California.

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