> The "alfalfa in the desert" stuff you hear about isn't for salads. It's feed for cattle.

Worse. It's feed for Chinese cattle in China. Alfalfa is shippable, and it gets shipped to the Chinese mainland. Economically speaking, alfalfa and water are pretty fungible, one's as good as the other, and they're buying it up subsidized by the US government to the detriment of American taxpayers. If we taxed alfalfa sold abroad to make the price reasonable, that nonsense would stop immediately.