id	keyword
ajee-2214	co2
ajee-2214	ekc
ajee-2214	energy
ajee-2214	effects
ajee-2214	hypothesis
ajee-2214	emissions
ajee-2214	countries
ajee-2214	pollution
ajee-2214	growth
ajee-2214	capita
ajee-2214	gdp
ajee-2214	kuznets
ajee-2214	curve