Freshwater is not evenly distributed across the globe, and its availability does not always follow international borders. In addition, access to even a sufficient water supply may be limited by economic, social, and political circumstances, such as war and ethnic conflict. As the human population continues to grow, and access to clean freshwater continues to decline, these problems are likely to intensify, particularly in areas with existing scarcities of water.

SOURCE: World Wildlife Federation/The Nature Conservancy