In this episode, Mike and Karen are joined by Rachel Coyle MBE, the Global Managing Director of the Behavioural Insights Team, to discuss the Cape Town drought and the successful "Day Zero" campaign that helped avert the crisis. They delve into how Cape Town faced a severe drought with dangerously low dam levels. In 2018, a team of behavioural scientists launched the "Day Zero" behaviour change campaign, which focused on simple, practical actions like using grey water and providing clear guidance on water-saving measures. This campaign not only successfully averted the crisis but also left a lasting impact on the community. Rachel also shares insights on the enduring effects of the campaign and how its strategies could be applied in other parts of the world.