The document discusses the Global Agricultural Concept Scheme (GACS), which aims to create a common concept base for interoperability across agricultural information communities. GACS has mapped and integrated over 13,000 commonly used terms from existing thesauri. It provides a proof of concept that is already being used. The document outlines a vision for all data repositories to be open and interoperable through shared semantics and linking ontologies and concepts to GACS. Challenges around mapping between different knowledge organization systems are also discussed.