Do you eat money?
Except for that whole pesky "lack of rain" thing--which was part of "climate" last I checked.
That would seem to indicate that California's Central Valley really isn't the best climate for growing almonds.
80% actually[0], and that only uses 8% of agricultural water in California. Given that dairy consumes 15% and only produces 1.4% of world yield (plus it can easily be done elsewhere), perhaps we should focus on that first.
Same thing, for practical purposes.