How many countries face water scarcity today and how many could face water scarcity by 2050? What percentage of the earth’s land suffers from severe drought today and how might this change by 2059?...

How many countries face water scarcity today and how many could face water scarcity by 2050? What percentage of the earth’s land suffers from severe drought today and how might this change by 2059? How many people in the world lack regular access to clean water today and how high might this number grow by 2025? Why do many analysts view the likelihood of steadily worsening water shortages as one of the world’s most serious environmental problems? Explain the connection between water shortages and hunger. How do scientists use satellites to measure changes in water supplies?