Cities in arid regions, such as Phoenix, Athens, and Kabul, face unique existential threats.
: Aridness is typically measured using the Aridity Index , which calculates the ratio of annual rainfall to potential evaporation. Biological Resilience: "Weird" is Effective aridness
: Larger organisms (macrofauna) are often more adapted to aridity than microbes, acting as the primary recyclers in hot, moisture-deprived habitats. The Urban Challenge Cities in arid regions, such as Phoenix, Athens,
: Experts argue that arid cities must move away from 1950s design paradigms to prioritize shade, walkability, and technological innovation to remain viable. The "Aridification" of the West Cities in arid regions