Clearing the AirBestselling environmental star Hannah Ritchie is back with a succinct, punchy new book that answers 50 of the key questions stopping us from tackling the climate crisis. 'We urgently need Hannah Ritchie' Guardian 'Essential reading' Rutger Bregman 'Read this book now' Mark Lynas We can't afford to delay climate action, but with all the shouting and disagreement, it's hard to know where to turn. In her new book, bestselling environmental star Hannah