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"But I can't imagine a 10 or 20 story office building roof providing even one day's lettuce or tomotoes for sandwiches for all the occupants at lunch time."

Apologies, I should have said a rooftop GREENHOUSE garden. Likely not economic, but I know they are doing it in Singapore. Possibly experimental.

This is also assuming most roofs - personally with modern communications, I don't think high density makes sense. My nickname for that is "Ground zero." Of course we are not ever going to have another war or terrorist trouble - - - I don't think!
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