“…• GDP t is the gross domestic product per capita (2010 constant US dollars) in year t. The square of real GDP per capital (GDPsq t ) is included in line with the predictions of the EKC hypothesis (Cetin, Ecevit, & Yucel, 2018;Karasoy, 2019;Shahzad, Kumar, Zakaria, & Hurr, 2017). Based on the predictions of the EKC hypothesis, the signs of θ 2 and θ 3 will be significantly positive and negative respectively to suggest an inverted U-shaped relationship between economic growth and environmental pollution.…”