New York,USA; Without deliveries, New York City would run out of produce in two days. But there is enough rooftop space to supply the entire city with all the fresh produce it can eat. And there are also windows.

Tokyo, Japan; A Subway Sandwich shop in Tokyo introduced a creative marketing ploy this week to bring in sustainability-minded customers: hydroponic lettuce grown on-site. The shop, located across the street from Tokyo Station, has a "vegetable factory" enclosed in glass that features hydroponically grown lettuce destined to land in customer sandwiches.