There will be underground cities around centered around water

Andrew Kudless (a.o.) : Designer
'Sietch Nevada projects waterbanking as the fundamental factor in future urban infrastructure in the American Southwest. Sietch Nevada is an urban prototype that makes the storage, use, and collection of water essential to the form and performance of urban life. Inverting the stereotypical Southwest urban patterns of dispersed programs open to the sky, the Sietch is a dense, underground community. A network of storage canals is covered with undulating residential and commercial structures. These canals connect the city with vast aquifers deep underground and provide transportation as well as agricultural irrigation. The caverns brim with dense, urban life: an underground Venice. Cellular in form, these structures constitute a new neighborhood typology that mediates between the subterranean urban network and the surface level activities of water harvesting, energy generation, and urban agriculture and aquaculture. However, the Sietch is also a bunker-like fortress preparing for the inevitable wars over water in the region.'
Credit: Andrew Kudless (Design), Nenad Katic (Visualization), Tan Nguyen, Pia-Jacqlyn Malinis, Jafe Meltesen-Lee, Benjamin Barragan (Model)