Add another item to the list of things in peril due to climate change: the entire American West.

According to a new study from the federal Bureau of Reclamation, the Colorado River won’t fare well over the next 50 years. Climate change, drought, and population growth all add up to far greater demand for water than the river will be able to supply by 2060.

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A large portion of the American West, especially its cities, rely on the Colorado. Almost 40 million residents of Arizona, California, Colorado, New Mexico, Nevada, Utah, and Wyoming depend entirely on the river’s water.

“This study should serve as a call to action,” said Interior Secretary Ken Salazar. But some of the possible actions outlined in the report are, well, nuts. From the Los Angeles Times:

The analysis lists a range of proposed solutions, including some that Interior officials immediately dismissed as politically or technically infeasible. Among them: building a pipeline to import water from the Missouri or Mississippi rivers and towing icebergs to Southern California.