Energy from the sun (and the wind and water energy derived from it)
is available indefinitely. Because the flow of energy is weak and variable,
very large collection systems are needed. Other sources don't renew or
renew only slowly.
| NSES Content Standard F
Science in Personal and Social Perspectives: Natural resources Grades 9-12, page 198 The earth does not have infinite resources; increasing human consumption places severe stress on the natural processes that renew some resources, and it depletes those resources that cannot be renewed. |