The frequency and duration of droughts will continue to increase due to human-caused climate change, with water scarcity already affecting billions of people across the world, the United Nations warned in a report Wednesday. The U.N. desertification agency, which is currently hosting a conference of parties in the Ivorian city Abidjan, estimates that roughly one third of the world’s population is already living in water scarce regions, with that number expected to double by 2050. But with the right adaptation measures, water scarcity across the globe can be limited, the report said.