so eat something else?

Agreed, but this is going to require changes by governments. Certain crops often get subsidies, whether they're the best option or not. There are healthier grains that can stand up better to climate change than rice. Many governments are so stuck into subsidizing specifically rice that they have backed themselves into a corner with a thirst crop that isn't all that nutrient dense. And unwinding those subsides is unpopular, even if it's ultimately the right thing to do.