[gsf_emergency_2]

>Trees excel at harvesting water.

Specifically, some kind of giant succulent would be best for arid climes

https://en.wikipedia.org/wiki/Aloidendron_dichotomum

[flakeoil]

But they probably don't evaporate water and cool as much as other plants and trees.

[gsf_emergency_2]

Right, but as pointed out in TFA & below the cooling from evaporation is almost negligible compared to that from the shade. Maybe Vegas would be okay with conserving their water too

It's counterintuitive..