How did Tehran end up in the world’s worst water crisis?

Iran is described as facing "water bankruptcy". What started as a slow-burning problem has now turned into a full-blown crisis. The capital region, home to more than 10 million people, could fail to meet the demand for water within weeks. No city has reached that point in recent human history, but some have come close. South Africa's Cape Town narrowly avoided hitting what is known as water "Day Zero" back in 2018. Since then, the world's climate has got warmer and drought conditions have got worse. Water shortages are threatening food security, fuelling conflict and already forcing millions of people to leave their homes. So will Tehran need to be evacuated? Is that even possible? And what can be done to address the water crisis there and elsewhere?

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