unfortunately their climates are not as conducive to grow certain crops otherwise they would grow them.
Instead of building a bullet train maybe we could build a water pipeline from other states that have offered us their plentiful water........OR how about a few more dams...... Solutions are simple, politicians are stupid.........
Conservation is far less expensive than building/maintaining water pipelines. That is why it is cost effective to pay people to remove their lawns. Desal is likely cheaper that new pipelines in a lot of areas too.