Iran's capital Tehran is counting down to "day zero" - the day the water runs out and the taps run dry. Reservoirs that supply Tehran's 15 million residents are almost empty. President Masoud Pezeshkian has urged people to use water sparingly - or the city, or at least parts of it, may have to evacuate. Sky's science correspondent Thomas Moore looks into how Iran is trying to avoid disaster. Read more: https://news.sky.com/story/the-countdown-to-day-zero-major-city-may-have-to-evacuate-as-water-supplies-run-low-13479538 #iran #tehran #water #drought SUBSCRIBE to our YouTube channel for more videos: http://www.youtube.com/skynews Follow us on Twitter: https://twitter.com/skynews Like us on Facebook: https://www.facebook.com/skynews Follow us on Instagram: https://www.instagram.com/skynews Follow us on TikTok: https://www.tiktok.com/@skynews For more content go to http://news.sky.com and download our apps: Apple https://itunes.apple.com/gb/app/sky-news/id316391924?mt=8 Android https://play.google.com/store/apps/details?id=com.bskyb.skynews.android&hl=en_GB Sky News Daily podcast is available for free here: https://podfollow.com/skynewsdaily/ To enquire about licensing Sky News content, you can find more information here: https://news.sky.com/info/library-sales