Here´s an idea of one of my favourite Canadian writers, Margaret Atwood. I highly recommend her book “Oryx and crake”.
Reading Toronto: “Someone could make a nice business combining the installation of green roofs and the using of the space to grow organic local flower varieties. No good in winter, but the building would still benefit from improved insulation.Once the roofs were in place, the building could actually rent the space for growing, thus profiting twice.”
