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This article analyzes the development of agricultural biogas in regard of its implicit objective, as a green energy, to preserve environmental commons by mitigating climate change. By adopting a holistic approach, we offer a broad perspective on the ecological impacts of the accelerated implementation of biogas installations in one French region, Brittany. Indeed, the agricultural specificity of Brittany is the huge importance of intensive farming—whether it be pigs, fowl, and cattle. The rise of biogas production creates ipso facto a dependence to intensive farming and its farming effluents, encouraging the pursuit of this production model. As a conclusion, this article states that what matters is the economic, political and international system in which one technology inserts itself. Ultimately, the ecological transition cannot abstract itself from economic and political dynamics which determine it.