This paper aims to explore relationship between population growth environmental pollution and economic growth in Iran. In this article, we use Hsiao causality test to identify this relationship. In addition, we contribute to this debate analyzing the trends of annual Data from
1978-2001. This relationship for Population Growth and Environmental Impact is from Population Growth to Environmental Impact. There is a bidirectional causality between economic growth and environmental economic. In other words, increase in GDP per capita exerts positive effects on environmental impact and vice versa.
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