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While environmental sustainability may have been intensified by different occurrences such as global warming, increased carbon emission, loss of biodiversity and natural resource depletion, there are concerns that rising population combined with the quality of institutions have serious implications on the attainment of environmental sustainability. While this may seem factual, tackling environmental problems by adopting population reduction policies might not necessarily guarantee a sustainable environment without addressing the quality of institutions. This chapter examines the effect of population growth on environmental sustainability as well as the interactive effect of population growth and institutional quality on environmental sustainability in West Africa region, using data from 2006 to 2019. Adopting the System Generalized Method of Moment method, findings indicate that population growth has a positive but insignificant effect on environmental sustainability. Population growth when interacted with institutional quality had negative and significant effect on environmental sustainability. The result demonstrates that environmental problems cannot be effectively addressed through population policy alone, hence the additional need for strong and institutional quality to ensure environmental sustainability in the region.