Doha isn't a shining example of sustainable city development but it still better positioned than Vegas, there are few key differences between the two. The popu

Doha isn't a shining example of sustainable city development but it still better positioned than Vegas, there are few key differences between the two. The population is roughly the same ~ 2.2 Million each[1], however Doha proper is very small at only 50 sq miles, compared to Las Vegas metro area of 1600 sq miles , even all of Qatar is only 4700 sq miles and most of that is empty desert. Doha is right next to the sea, desalination plants supply 99% of its water supply reliably. Vegas on the other hands gets bulk of its water from Colarado river(via Lake Mead) and rest from ground water, both come with its own set of problems. Colarado river water is weather variable and also sharing the water is complicated by the pact between the 7 states that share the water. Qatar is very gas rich and can run those desalination plants pretty cheaply, plus they have no choice but to live where they are i.e. there aren't other alternative locations they can live at, Vegas residents have freedom of movement to rest of the U.S. and with tougher climate may find those cheaper/ attractive. [1] Out of the 2,000,000 only 300,000 or so are citizens/permanent residents, rest are immigrant workers without permanent residency rights, meaning they would leave when there is less work or visa is not renewed if the government desires to reduce the population of the city, they wouldn't need to convince/pay and provide alternative location foreign workers - who rarely are allowed or bring their family with them and would leave if there is no money to be made without a movement's regret.