For the Instructor
These student materials complement the Water Science and Society Instructor Materials. If you would like your students to have access to the student materials, we suggest you either point them at the Student Version which omits the framing pages with information designed for faculty (and this box). Or you can download these pages in several formats that you can include in your course website or local Learning Managment System. Learn more about using, modifying, and sharing InTeGrate teaching materials.Population growth vs. water needs
Do we have excess capacity to supply this water? That is an important question, but you have probably already determined that the real issue is where the population growth occurs and what water resources are available there. The major growth is projected to occur in developing countries (Figure 17). African nations are likely regions for greater than average growth. Interestingly, much of Africa is estimated to have significant groundwater resources (BGS, 2013) that could be developed if necessary. In fact, Nigeria is projected to surpass the population of the U.S. by 2050 (Figures 17-19). One must examine the population density and rate of projected growth vs. water needs. In addition, climate change impacts must be considered.
Figure 17. The distribution of population by country scaled by China (largest red dot) at 1.36 billion people in 2010. (World plot)Source: Gapminder
Figure 18. Top 10 countries by population from 1950 to 2050, according to UN data.Source: United Nations
Figure 19. Fertility index (children per woman) by country as a function of per capita income for 2012. Note the higher fertility for African countries. China and the U.S. are well below 2 children per woman.Source: Gapminder
Learning Checkpoint
1. What is the relationship between Total Fertility and Per Capita Income shown in Figure 19 above?
2. Why might this be an important consideration when considering future demand for water?




