We are at a critical point in human history and that of the planet. In this book, a world leader in agricultural research, Professor Sayed Azam-Ali, proposes a radical transformation of our agrifood system. He argues that agriculture must be understood as part of global biodiversity and that food systems have cultural, nutritional, and social values beyond market price alone. He describes the perilous risks of relying on just four staple crops for most of our food and the consequences of our current agrifood model on human and planetary health. In plain language for the wider public, students, researchers, and policy makers, Azam-Ali envisions the agrifood system as a global public good in which its practitioners include a new and different generation of farmers, its production systems link novel and traditional technologies, and its activities encompass landscapes, urban spaces, and controlled environments. The book concludes with a call to action in which diversification of species, systems, knowledge, cultures, and products all contribute to The Ninth Revolution that will transform food systems for good.