Can a planet have legal rights? Could it be defended in a court of law? In recent years ordinary people have turned to courts around the world seeking justice for environmental damage: melting glaciers, sinking islands, extinction of species, and more. Monica Feria-Tinta is a barrister advocates not just for people but also for Nature itself, for the diversity of life that sustains us. A Barrister for the Earth explores eight critical cases she has successfully fought. In conversation with Rachel Sloane