An October 8 press release by the Potsdam Institute for Climate Impact Research said an additional 8 percent of the world population could face water scarcity issues should global temperatures rise 3.6 degrees Fahrenheit. If there is a 9 degree Fahrenheit rise in temperatures, the number affected could reach 13 percent. The report said over one billion people already live in water-scarce regions, identifying parts of Asia, the Mediterranean, the Middle East, and North Africa as particularly vulnerable regions.