http://www.ecofriend.org/entry/eco-architecture-la-restaurant-serves-organic-roof-grown-veggies/

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http://vision4ourcities.com/blog/?p=279

http://landscapeandurbanism.blogspot.com/2010/05/vertical-agriculture-modest-proposals.html

http://www.gardenvisit.com/blog/2010/04/24/towards-a-greener-london-with-help-from-sheep/