GREEN
05/27/2009 05:12 am ET | Updated May 25, 2011

The Green House Of the Future

What will the energy-efficient house of the future look like?

It could have gardens on its walls or a pond stocked with fish for dinner. It might mimic a tree, turning sunlight into energy and carbon dioxide into oxygen. Or perhaps it will be more like a lizard, changing its color to suit the weather and healing itself when it gets damaged.

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