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This article re-examines the effects of governance/institutions on the quality of the environment captured successively by the emissions of carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) in the countries of the Community. economy of Central African States (ECCAS), under the hypothesis of the environmental Kuznets curve (CEK). The econometric model is inspired by the work of Grossman and Krueger (1991, 1995) and is estimated successively by generalized least squares (GLS) and double least squares with instrumental variables (DMC-IV). Two main results emerge from the study. Initially, there would be a “Pseudo CEK” in the shape of an “N” between economic growth and the different types of pollutants. Greenhouse gas (GHG) emissions would then follow a sinusoidal or cyclical trend in ECCAS. Secondly, improving governance would make it possible to significantly reduce polluting emissions in the countries under consideration. Therefore, the strengthening of programs of governance and improvement of the quality of institutions will generally contribute to reducing the levels of greenhouse gas (GHG) emissions in ECCAS countries.