Listen to The Inquiry - Why are our taps running dry? by BBC World Service on Podcast Addict. Chennai, São Paulo, Mexico City, Tehran, Cape Town - these cities have all faced the threat of a ‘Zero Day’, or, having no fresh water left in their taps. The UN says we’re entering a ‘water bankruptcy’ era, meaning our water ‘current accounts’ are running empty, while our ‘savings accounts’ - the long term stores of water deep underground - have been depleted, w