Cities across the western world, especially those geographically situated in cold climates are struggling; they are trying to move toward urban sustainability, putting in place many programs and improvements to move in the right direction to decrease their carbon footprint and create long-term prosperity. One of the major improvements possible within the urban setting is to alter the way food is produced and consumed. Improving the agricultural system is the central theme of this research. Currently the western world operates on a mainly globalized food transportation system fuelled by fossil fuels. This creates potential food security, food sovereignty, and future urban sustainability difficulties. Therefore it is desired to move the agricultural system towards one which is mainly decentralized local growing. To do this the current greenhouses present in cold climates like Calgary need to be dramatically changed, improving energy efficiency. Three central issues were further examined: 1. Brownfield sites - Urban areas are difficult to produce food in economically due to high land prices; therefore utilizing brownfield sites is a solution to this problem. In them there is a large area of land within the urban setting attainable at a very low cost. 2. Greenhouse efficiency through design and technology improvements is necessary immediately if sustainability improvements are desired through moving to local agriculture. 3. Utilizing waste heat sources is important moving into the future. In this project the initial feasibility of using effluent waste water from the Bonnybrook WWTP in Calgary was examined. It was found through comparative analysis with other potential water sources to yield a financial gain, and a net energy gain. Further research is needed to make a full determination on the viability of the waste heat source.