Enteric methane is the single largest source of direct greenhouse gas (GHG) emissions in the beef and dairy sectors, representing 2.5% of total U.S. GHG emissions. Led by Dr. Alexander N. Hristov, researchers are investigating using a non-synthetic form of an anti-methanogenic compound, 3-nitro-1-propionic acid (3-NPA), derived from plant and fungal sources as a feed additive to reduce enteric methane in ruminants.