id	keyword
afs-137608	farms
afs-137608	milk
afs-137608	emissions
afs-137608	dairy
afs-137608	production
afs-137608	matching
afs-137608	use
afs-137608	et al
afs-137608	land
afs-137608	meat
afs-137608	ghg
afs-137608	dairy farms
afs-137608	energy
afs-137608	mean
afs-137608	study
afs-137608	groups
afs-137608	margin
afs-137608	nitrogen