Water is the most pressing issue and here is why.
1. More water in the west has been allocated by laws and agreements than actually exists, even on a regular basis.
2. Water is priced differently to urban users and farmers because of contracts and laws.
If farmers "paid" the same rates as urban dwellers, there would be no cotton, hay, alfalfa or mellons grown in California.
3. Points 2 and 3 are more important than the bs that is fed to people by the politicians that you should conserve water, recycle water and so forth.