This paper investigated the validity of Environmental Kuznets Curve (EKC) hypothesis in Nigeria using the Autoregressive Distributed Lag model (ARDL) estimated with the Ordinary Least Square (OLS) technique. The study used annual secondary data obtained from the World Bank indicators and the Central Bank of Nigeria for the period under review (1980-2018). Findings from the study support the validity of the EKC hypothesis for CO2 emissions. The study therefore recommended a harmonious environmental and economic policy mix that would engender greater income but keeping the protection of the environment a priority.