The human population of the Central Valley region of California almost doubled between 1962 and 2002. The graph below shows the change in groundwater storage of several areas within the region during this time of population growth.
Image courtesy of USGS
The bold, dark blue line on the graph represents the change for the entire Central Valley groundwater system, which is the largest water reservoir in the state of California. Based on the graph, which of the following is true?
A.
An increase in the human population only impacts surface sources of consumable water.
B.
An increase in the human population does not impact water consumption on a large scale.
C.
As the human population increases, water consumption generally decreases.
D.
As the human population increases, water consumption generally increases.