AGROVOC Multilingual Thesaurus
FAO thesaurus for agriculture, forestry, fisheries, food. 40,000+ concepts in 40+ languages.
Visit WebsiteBrowse the tree, filter it, or click any class to see just its corner of it.
Where this one tends to earn its keep.
Agricultural research data indexing
Food security knowledge management
Fisheries data classification
International agricultural development projects
I haven't checked this label against the actual licence text — it's the catalogue's original guess. Check the ontology's own site before you rely on it.
Others worth a look in Agriculture & Environment.