In The Salts of the Earth, Kerstin Hoppenhaus embarks on a fascinating journey, revealing how phosphorus, nitrogen, and potassium—the building blocks of life—shape our world. The biologist shows how the intensive use of these elements is contributing to the ecological crisis, exacerbating inequalities, and impacting our food systems. The book offers a comprehensive overview, from the beginnings of agriculture to the current challenges facing global food security, and inspires reflection.