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When Cape Town revealed it was fast hurtling towards the moment it would become the first city on Earth to run out of water in 2018 it caught the world's attention.

But despite the odds appearing stacked against it, "Day Zero" was never reached. The rains finally arrived, and Cape Town pulled itself back from the brink - for now. So, what lessons have been learned?

Professor Martine Visser, a behavioural economist at the University of Cape Town, told The Climate Question, how local residents were given a little "nudge" to change their water usage.

Photo: Cape Town dam with dry and cracked soil. Credit: AFP