And what will be the source of the water for additional California residents to subsist on? We just went through a 7-year drought, and they seem to be becoming more frequent and longer; never mind that climate change is making it all worse, as the snow-pack gets smaller and melts quicker.

We can cut agriculture and build more dams somewhere to buffer more snow melt, but these are politically difficult to pull off, and of course have other negative effects on various constituencies (including migrant workers, like the ones who used to pick the crops where Silicon Valley now sits).