A few decades ago, cave homes in China were simple dark affairs with tiny doors like this one.
A few decades ago, cave homes in China were simple dark affairs with tiny doors like this one. Tim Johnson / MCT
A few decades ago, cave homes in China were simple dark affairs with tiny doors like this one. Tim Johnson / MCT

World

December 16, 2008 4:03 PM

Energy efficient home, easy to maintain — and no mortgage

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