Americans spent $432 billion to power their homes and commercial buildings in 2011 -- but it doesn't have to be that way, writes John Mandyck, chief sustainability officer for United Technologies Climate, Controls & Security. Newer technologies can make buildings more energy efficient, helping the planet and driving down costs for everyone. "Now is the time to make energy efficiency the driver of world-class innovations -- and there's no better place to start than with our buildings," Mandyck writes.

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