id	keyword
american_scientific_journal-5596	pollution
american_scientific_journal-5596	water
american_scientific_journal-5596	nigeria
american_scientific_journal-5596	oil
american_scientific_journal-5596	air
american_scientific_journal-5596	environment
american_scientific_journal-5596	act
american_scientific_journal-5596	convention
american_scientific_journal-5596	water pollution
american_scientific_journal-5596	land
american_scientific_journal-5596	air pollution