id	keyword
app01-7980	concrete
app01-7980	life
app01-7980	cycle
app01-7980	lca
app01-7980	construction
app01-7980	waste
app01-7980	assessment
app01-7980	co2
app01-7980	cdw
app01-7980	aggregate
app01-7980	materials
app01-7980	results