I first talked about roof-top gardening in August 2010 and believed that farm-to-table and urban-farming could be a great entrepreneurship idea. Fourteen months later, I am glad to see that roof-top farming has already become a common scene in New York City. As shown in this ABC News video , solar energy and hydroponics system can help urban farmers create an almost complete control environment. Vegetables are harvested in 30 to 35 days. People can enjoy fresh vegetables that are grown right in their neighborhoods. One may assume that it would cost a lot to install the solar panels and the hydroponics system, but I believe that such expenses can be offset by the ability of yielding fresh produce in a consistent and controlled manner as well as the low shipping costs. Roof-Top farming is already here. It seems that in the future, cities will rely less on rural areas for produce. What can traditional farms do to prepare for this foreseeing change?