The Colorado River is drying up, and visibly so; the Colorado River has not flowed into the Sea of Cortez since 1998. Why? The ever-increasing human population has resulted in an increasing demand for water, resulting in more water being used. The demand for electricity to power cities has resulted in almost one hundred dams being built in the Colorado River. The demand for food and other goods that need to be grown has led to increased irrigation.
What can we do about it?
There are plenty of ideas of curbing water use agriculturally, such as planting crops that require little water and irrigating the Colorado River's outlying farmlands with underground piping. But there are also conservation efforts that are already in affect: The United States and Mexican governments are collaborating as part of an agreement called the "Minute 319," whose goal is to send one percent of the Colorado River's historic flows down to the river's delta to keep it wet. This will hopefully help restore native wildlife to the delta.
Work Cited: http://www.nationalgeographic.com/americannile/