An interesting thread, but getting close to political. Let me clarify one item--it has been stated that Glen Canyon dam supplies power to S. Calif. This is not true.
From the bureau of reclamation web site on
Glen Canyon Dam:
Glen Canyon Powerplant produces around five billion kilowatt-hours of hydroelectric power annually which is distributed by the Western Area Power Administration to Wyoming, Utah, Colorado, New Mexico, Arizona, Nevada, and Nebraska. In addition, revenues from production of hydropower help fund many important environmental programs associated with Glen and Grand canyons.
I wonder about Nebraska--but that is what it says.
Hoover Dam supplies S. Calif Az and NV
There always have been water challenges in the west from the early settlement.
I certainly agree that Cabo has been ruined by tourism....but one might say the same of S. Calif.
However you cannot always go back in time. If Glen Canon dam were removed, there is many cubic acres of silt and sand, which has built up--I wonder what the effect of this will be on Grand Canyon when the first major flood event occurs and eventually Lake Mead?
Desalination plants also have an environment impact: These include intake issues on marine biology, as well as the discharge of large volumes of concentration brine into the salt water environment.. (back to "dilution is the solution"...or is it?
Each time we drive across the US South West (2x a year) we notice more wind mill farms, and solar projects. Both of these are also not free of environmental impacts.
No judgements here, but just consider all of the factors...
Killer hurricanes--solutions? Obviously not lived in the area where there are those "Killer hurricanes"--create more problems than solved... For example it was over 12 years since our street recovered from a class III storm. Now people who build homes on the water have no knowledge of the effects and consequences of Ivan. Check out Waveland, MS, or nearby cities in the path of Katrina--or Homestead, FL (Andrew 1992)--rebuilt and almost forgotten, but still scars. So solutions there...