Landscape Architecture to the rescue?
Linked is a very interesting article that takes me back to 1st year uni. It talks about the necessity of green spaces within an urban setting or at least the opportunity for the occupants to take some time out and leave the city periodically, to help with the mental health of the occupants. Apparently a fair few studies done in the States as well as here concluded that even with the smallest amount of green space the test subjects were able to achieve better scores on memory tests and the such, in relation to similar test subjects without the same exposure to green or nature.
Read it, on a side note they mention something about drinking Red Bull and designing office spaces...little do they know that Landscape Architects probably drink a lot of Red Bull and design landscapes...as if it's a bad thing!

Link via The Boston Globe.