‘Urban farming’ can mean many things. For some people it amounts to little more than growing herbs on their window sill — admirable, of course, but hardly what you could call a commercial enterprise.
Other urban growers, though, really are farming — in the sense of raising crops in volume that they then sell on to other city dwellers.
Here’s a recent profile of one such farm in Brooklyn, NY. As journalist Tracie McMillan points out, the result is not only that environment gets beautified, residents gain a new source of fresh produce, and children get to see where their food comes from — people (often with very low incomes) are also making real money from these enterprises. No wonder that after years of seeing agriculture and urban life as essentially incompatible, many cities are starting to look upon urban farming positively and developing policies to encourage it.
EarthQuaker 
Hey! Thanks for all the great info. I was browsing through a bunch of green websites and blogs and I came across yours and found it very interesting. There are a bunch of others I like too, like the daily green, ecorazzi and earthlab.com. I especially like EarthLab.com’s carbon calculator (http://www.earthlab.com/signupprofile/). I find it really easy to use (it doesn’t make me feel guilty after I take it). Are there any others you would recommend? Can you drop me a link to your favorites (let me know if they are the same as mine).