The chemical reactions and pathways resulting in the formation of H2 (dihydrogen). [ GOC:TermGenie http://www.ncbi.nlm.nih.gov/pubmed/20692761 GOC:mengo_curators http://www.ncbi.nlm.nih.gov/pubmed/20395274 ]
Synonyms: H2 biosynthesis hydrogen formation hydrogen biosynthesis hydrogen anabolism hydrogen generation hydrogen synthesis hydrogen production molecular hydrogen biosynthesis dihydrogen synthesis