[jonnathanson]

" Some avocado farmers can no longer compete with avocado farmers in wetter areas of the US or Mexico"

And therein lies a thorny political issue. Generally speaking, when this sort of shift starts happening, farmers and agribusiness lobby the government (state and/or federal) for tariffs and subsidies, in order to protect their price competitiveness against foreign or out-of-state producers. This is a vicious cycle, and we need to find the political will to stop it when it comes. Which leads to further issues: can a governor of California get elected who is seen as hostile to Californian agriculture? Possibly, but oh man, would he or she be in for a fierce battle. Central CA is a very powerful voting bloc, and farm lobbies are very powerful at the state level and in D.C.