Clean, fresh water is in shorter and shorter supply. The biggest use of fresh water is farming; so, decreasing the human population (less food needed) and increasing government regulation for sustainable farming should help the supply of fresh water. People like the U.S. Southwest; and Southwest real estate developers want to bring more and more people into the Southwest U.S. because the developers make more money. 5 of the largest 10 cities in U.S. get their water from the largest U.S. reservoir, Lake Mead, formed by damming (Hoover Dam) the Colorado River.
Los Angeles, CA
San Diego, CA
San Jose, CA
San Antonio, TX
Two more of the largest 10 cities in U.S. are also in Texas: Houston and Dallas. That only leaves 3 of the largest 10 cities in U.S. that are not in Southwest U.S. (New York City, Philadelphia, PA, and Chicago, IL
Much more water is being taken out of Lake Mead than the Colorado River is putting in. Lake Mead water presently flows to 7 states: Nevada, New Mexico, Arizona, (southern) California, Wyoming, Utah, and Colorado. Nevada (Las Vegas) and Arizona are targeted to return to desert wastelands. California produces 80% of U.S. winter vegetables. In desert regions like the Southwest U.S., state and local governments must be willing to regulate for sustainable farming and a sustainable human population (deny house building permits, deny new business permits, deny more farming). Some democracies are Socialistic with freedom and social justice as the main concerns; other democracies like the U.S. are capitalistic with freedom and competitively making money as the main concerns which makes “sustainability” a hard concept.
In the U.S., water eventually flows into the Atlantic Ocean, the Pacific Ocean, or Salt Lake. In Utah, should we start collecting water before it gets to Salt Lake? Some of these dry states have mountains with winter snowfall. Should they capture the snow melt? Will we be good stewards?