This is a window farm. A hydroponic creation involving a lot of plastic bottles hanging in your window with fresh food growing out of them. You should go to
to find out more about them. Hydroponics has never been my cup of tea, I have to say, only because I prefer the more natural and well, down to earth feel of the Earth. But Window Farms originated in Brooklyn, where gardens are a privilege a lot of apartment dwellers don’t have, and there’s no denying these are innovative. There’s a whole online community to support the worldwide network of urban food growers.
It’s proactive, and I like that. In big cities there isn’t room for community gardens so here is a fantastic example of people taking what they have a making use of it.
(All images from the official website linked to above).
Earth Baby 
I love this too, for apartment dwellers who want the joy of growing their own food, and who don’t have access to their own green spaces. I saw a video about this a few months ago. I hope it really catches on!
This is fascinating, growing green window- blinds! Have you looked into people keeping bee-hives on rooftops in US cities?
I hadn’t, but I’ve found this quite interesting article after a quick google: http://www.aol.com/2011/07/29/healthy-bees-hives-thriving-us-cities_n_913079.html – It says that sort of urban hobbyist bee-keeping is helping their numbers.. Also in cities bees have a longer pollen-collecting season as people plant flowers all year round. Thank you for telling me about it!
Also thanks for the comments both of you, I really appreciate the discussion. (:
I enjoy the manner in which you have discussed this particular subject. Very helpful.
I look forward to viewing the other comments.