Urban Farming

In some well developed cities, the urban farming become one of the famous activities.  They will try to use the gardens, roof top, or some empty space for the agriculture use. To promote the urban farming, the cities can enjoy the advantage in three different ways:

For socially, the urban farming can be the educational use. It also can help the city to build up more space for the social to relax use. For environment, the urban farming can green up the city. The roof top farming can help to control the storm water runoff. Moreover, the garden can clean up the air and the rain water.For economically, the food product can be sell on the market and earn the money. It also can create the job opportunity for the farmer.

In Hong Kong, there are some of the commercial building in CBD, for example, the Bank of America Tower, will also use the roof top of the building to set up a system for agriculture use.  It can give the chance to the staff to take rest in the roof garden during the break.

Reference:
https://www.oxy.edu/sites/default/files/assets/UEP/Summer_Research/HK%20Rooftop%20Farming%20Project.pdf
http://www.timetogrow.hk/