> As a side note, agriculture uses up lots of water in deserts (more so than people), so it seems like in desert spaces like Idaho, solar would make a lot more sense than agriculture would. And we should move the agriculture to where the water naturally falls from the skies.

The problem is that in many of those places where enough water naturally falls from the sky the soil and/or the weather isn't as good for growing food.

It is generally much easier to move water to a low water place that has great soil and/or weather than it is to move soil or weather to a high water place that is missing good soil or weather, and so here we are.