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Some of the comments made there are pretty interesting, specifically that it's not about the use of water its about the waste.

-Ground water can be at least partially recouped through wells. This would be a really interesting number to look up.

-Sewage water is wasted as it is dumped into the sea.

Anything else? Where does water leave the cycle?

Meat+Dairy uses the same amount of water as agriculture. People are just using almonds as a scapegoat.

I've seen a lot of different numbers, most of them seem to be napkin math.