[mitb6]

That's because that doc is talking about Southern Nevada (read: Vegas) in isolation, 78% of Nevada water usage is agriculture (followed by 13% residential, 7% mining)

https://extension.unr.edu/publication.aspx?PubID=4764

[tshaddox]

True, and also 75% of Nevada’s population is in the Las Vegas metro area.

[smus]

You understand that factoid strengthens the point of the person you're replying to right

[Eavolution]

This is relevant though towards the argument that Vegas isn't typical in it's water consumption and trees may well have a much more detrimental effect than in other places.