Environmental journalist Tim Smedley gives a thought-provoking and gripping look into his newest book The Last Drop, an investigation into the world’s next great climate crisis: the scarcity of water. Looking at how countries have been addressing water quality issues caused by pollution as well as human mismanagement of water, Smedley offers a fascinating, honest and ultimately hopeful account of the crisis and how we might address it before it’s too late. He talks to Hay Festival Sustainability Director Andy Fryers.