A green city blooms in the desert
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Today's offices blow highly chilled air from the ceiling, wastefully cooling the entire space. Here air doesn't need to be as cold, since it circulates from the ground up.
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Last updated December 03 2008: 10:34 AM ET
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Eco-friendly city of the future
The Emirate of Abu Dhabi begins construction on its green city, Masdar. See the plans for this $15 billion undertaking.