Two-thirds of the annual surface runoff in rivers and streams is not available for human use.

Question

Quizplus · Accepted Answer

This is true. According to the United Nations, only one-third of the world's freshwater is available for human use, while the remaining two-thirds is locked in glaciers, permafrost, and inaccessible underground aquifers. Furthermore, much of the surface water that is available for use is heavily polluted or mismanaged, further limiting its usability.

Two-Thirds of the Annual Surface Runoff in Rivers and Streams