EVERYDAY SCIENCE

Detailed explanation-1: -Groups that are more wealthy use more water, for all purposes, across all livelihood zones. Differences are especially pronounced in the dry season (See Figure 1).

Detailed explanation-2: -In many areas of the United States, the demand for freshwater is likely to increase while supplies decrease due, in part, to a changing climate. Other contributing factors include an increase in human population, and changes in land use and energy generation.

Detailed explanation-3: -Because water is essential for food production, the scarcity of water results in food shortages, leading to famine and under-nourishment. This situation takes place in low income countries, where people depend on local agriculture for food.

Detailed explanation-4: -Population growth is in general constrained by food production, which in turn depends on the access to water resources. At a country level, some populations use more water than they control because of their ability to import food and the virtual water required for its production.