id	keyword
american_scientific_journal-6555	production
american_scientific_journal-6555	energy
american_scientific_journal-6555	solar
american_scientific_journal-6555	electricity
american_scientific_journal-6555	wind
american_scientific_journal-6555	crete
american_scientific_journal-6555	vehicles
american_scientific_journal-6555	hydrogen
american_scientific_journal-6555	fuel