Last month saw the hottest start to June on record, the arrival of increasingly normal hosepipe bans and water infrastructure targeted in the Russia-Ukraine war. As things heat up, aquifers shrivel – and London's 90-day-supply of water means the city is never far from having its taps run dry. That's Day Zero: a benchmark that several cities around the world have come alarmingly close to – or, in some cases, already reached – in the last decade. We spoke to Priti Parikh, professor of infrastructure engineering and international development at University College London, about the looming threat of Day Zero
