Underground farming and Housing

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Drewy7
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http://www.treehugger.com/files/2007/07/pasona_o2_urban.php

I was reading about this, it is rather old news, but why don't we hear about more underground farms and homes?  This could potentially preserve a lot of trees.  It would also save a lot on the heating bill because you would conserve more heat underground.  Just sharing.