Ewane, E.B. and Ewane, E.I. 2023. Foreign Direct Investment, Trade Openness and Environmental Degradation in SSA Countries. A Quadratic Modeling and Turning Point Approach. American Journal of Environmental Economics. 2, 1 (May 2023), 9–18. DOI:https://doi.org/10.54536/ajee.v2i1.1414.