id	keyword
economy-3432	poverty
economy-3432	sustainability
economy-3432	study
economy-3432	development
economy-3432	variables
economy-3432	growth
economy-3432	africa
economy-3432	pollution
economy-3432	countries
economy-3432	sub
economy-3432	quality
economy-3432	journal
economy-3432	world
economy-3432	environment
economy-3432	test
economy-3432	results