UK gardens cover a total area of 4,000 square kilometres – that’s a quarter of the size of Wales – and comprise an estimated 24-36% of the area of UK cities. Rapid global urbanisation is threatening biodiversity, yet Kate Bradbury’s latest book, One Garden Against the World: In Search of Hope in a Changing Climate, shows how even the smallest garden can play in supporting wildlife – a powerful reminder that individual action can collectively lead to significant environmental impact.