For one, the trees used here are mostly the desert variety that can withstand the hash conditions of our summers and infrequent waterings [1] -- they're actually quite beautiful too!
Secondly, LV is one of the most water efficient cities in the world. We recycle nearly all of our indoor water back into Lake Mead, and despite the city growing by 800K over the last 20 years we've reduced per-capita water consumption by 55% [2]
Our water crisis is a symptom of the water rights debate between the four states, not our over-consumption of water. You could actually eliminate the state of Nevada from the water crisis debate over the Colorado river and we wouldn't even make a _dent_ in the impact, it's the irrigated deserts of AZ and water intensive farming in CA that's the unsustainable piece (coming from a proud local who grew up in LV).
For sure a concern. Water-stress on one hand vs pretty dirty electricity sources (NV is like 2/3rds fossil fuel iirc) on the other. The overall calculation would be pretty complicated (and like how water-hungry are these trees?) but presumably someone's done it...
