Water scarcity impacts people’s lives in many countries already today. Future population growth will increase the demand for freshwater even further. Yet in addition to this, on the supply side, water resources will be affected by projected changes in rainfall and evaporation. Climate change due to unabated greenhouse-gas emissions within our century is likely to put 40 percent more people at risk of absolute water scarcity than would be without climate change, a new study shows by using an unprecedented number of impact models. The analysis is to be published in a special issue of the Proceedings of the National Academy of Sciences that assembles first results of the Inter-Sectoral Impact Model Intercomparison Project (ISI-MIP), a unique community-driven effort to bring research on climate change impacts to a new level.
When we burn hydrocarbons we get Carbon Dioxide and Water produced, so the other 60% of people must also have water they don’t want. It must be an issue of water distribution rather than just scarcity.