Iran's capital is facing its worst drought in recorded history. The President warns the only option may be to evacuate Tehran. Some commentators call that idea 'a joke'. But water cuts have begun - and no rain is expected. How did things get this bad? And how many of the world's cities face a similar fate?

In this episode: 

• Peter Newman - a Professor of Sustainability at Curtin University.
• Marcus D King - director of the Masters program for Environment and International Affairs at Georgetown University.
• Allam Ahmad - President of the World Association of Sustainable Development.

Host: Bernard Smith

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