Running the trains had been more difficult on the Manhattan side of the river, the official said, because there wasn't sufficient power to operate ventilation fans to clear diesel fumes.

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She believed the solar-paneled roof would power the entire car, not just the ventilation system, as is actually the case.

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Mr. Garrison, the architect, said each one features skylights and extensive natural ventilation, with solar panels on their roofs to generate power.

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The ship generates and distributes its own power, provides and maintains sanitation, heating, ventilation and air conditioning systems, and makes several hundred thousand gallons of water every day from sea water.

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The silver cylinder at the top is actually a small power generating device that converts micro-vibrations into usable energy, so stick one of these on, say, a ventilation duct and you should just about get enough juice to power a calculator or even an LED.

ENGADGET: Mitsumi exhibits micro-vibration power generator and batteryless RF switch (video)