Global population is expected to increase by three billion or more over the next 50–75 years, and the number of people living in urban areas will more than double. most of the world's population growth will occur in developing countries. more than 1 billion people do not have access to safe and affordable drinking water. in fact, inadequate drinking water quality is a leading cause of infant mortality worldwide. what proposed solution may with this problem? a) increased storage facilities for clean water b) decrease the number of motor vehicles sold in the united states c) development of newer, faster methods to protect endangered species d) give more money to the poor countries without increasing education