Circular Economy in the Agri-Food Sector: An Introduction : The Agri-Food sector globally faces food resource scarcity and food waste challenges throughout the food supply chain. There are substantial food losses and food wastes in supply chains globally, from farm gate to table, mainly due to lack of required market infrastructure, ignorance and lack of safe transport, improper packaging, lack of standardization and grading, underdeveloped cold chains, and insufficient processing.