The market-leading textbook on this topic, the first edition was groundbreaking in the field and subsequent updates have maintained this as the definite work on Agroecology. A Companion Website offers the entire contents of the updated practical manual, Field and Laboratory Investigations in Agroecology, to book buyers, split into student and lecturer resources. These 24 sample investigations facilitate hands-on learning that involves close observation, creative interpretation, and constant questioning of findings. There is newly streamlined treatment of agroecology's foundations in ecological science, making the text more compatible with typical course curricula. A wealth of new content has been added while maintaining the book's concise, affordable format. The book uses a unique framework that presents agroecology as a science, movement, and practice. Updated case studies and updated chapter content incorporates the most recent knowledge, issues, progress, and research. New chapters offer brand new content: (Alternatives to Industrial Agriculture, Ecological Pest, Weed, and Disease Management, Urban and Peri-urban Agriculture, Agriculture and the Climate Crisis) while a revised analysis and critique of the food system's embeddedness in the extractive capitalist world economy reflects ideas in the emerging field of political agroecology. There is more explicit content on co-creation of knowledge, participatory and transdisciplinary research in this edition than any other.