regional basis, all areas around the world and virtually every economic sector would be affected.
Water is a natural resource of planet Earth, and affects all natural, social and economic systems. As recognized by the Fourth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC) in 2007, observational evidence from all continents and most oceans shows that many natural systems, on which the hydrological cycle and therefore water availability, water quality, and water services depend