From my point of view, it's to put things in perspective. When people start ranting about where the water for a new apartment building will come from, when they

From my point of view, it's to put things in perspective. When people start ranting about where the water for a new apartment building will come from, when they live in some single family unit with a big lawn... it's kind of ridiculous. It's just NIMBYism. Of course, we should all strive to preserve water as a precious resource. But to do that at a systemic level, you have to understand where it's going. Also, there's agriculture and there's agriculture: growing, say, alfalfa to feed to cows is way less efficient than other crops.