Iran is grappling with its worst water crisis in decades after a scorching summer. President Masoud Pezeshkian has cautioned that if rainfall does not arrive by December, the government must start rationing water in Tehran and may even have to evacuate the city. »»» Subscribe to CBC News to watch more videos: http://bit.ly/1RreYWS For breaking news, video, audio and in-depth coverage: https://www.cbc.ca/news Follow CBC News on TikTok: https://www.tiktok.com/@cbcnews Subscribe to CBC News on