Water is the source of all life in the Planet. In cities, water carries benefits that are usually taken for granted by most people. We only become aware of its importance when we lose access to supply or face shortages. The relationship between water-energy-land resources and their respective policies can be explained briefly. Water policies, for example, are commonly based only on water analysis (elaborated and regulated by a specific agency) and they might have unforeseen adverse effects specially on energy and land resources and the climate. The same happens to energy/land resources, as policies are based only on the analysis of energy/land issues. Since the current policies are based on existing models that usually focus on one resource and ignore interconnections with other resources, better methods and models that consider all the interlinkages among water, energy and land are needed. Thus, a water-energy-food nexus approach that considers both the physical and the economic implications of different policy strategies could be a major opportunity for integrated solutions that respond to the interdependencies of water, energy, food and economic systems (IISD, 2013).
IISD (INTERNATIONAL INSTITUTE FOR SUSTAINABLE DEVELOPMENT), 2013, The Water–Energy–Food Security Nexus: Towards a practical planning and decision- support framework for landscape investment and risk management. IISD Report. Written by Bizikova, L., Roy, D., Swanson, D., Venema, H.D., McCandless, M. Canada, International Institute for Sustainable Development, Manitoba, Canada.