Agroecology is the study of sustainable food systems. As an integrative, holistic field, agroecology explicitly treats food as part of a system and series of relationships. Agroecology deals with time and space in a multi-scalar way, because an action that is beneficial in one time and place for a particular food system may be detrimental elsewhere. Agroecology is interdisciplinary, purposefully engaging with ecological, economic, and social parameters of food systems. An agroecological approach frames agricultural spaces as ecosystems and explicitly include humans, because ecosystem processes, politics, economics, culture, and society all affect food system function. Finally, agroecology has a storied history of action, with many agroecologists defining their field as a movement for social change.