This article provides a critical sociopolitical evaluation of ecological transitions across the European Union, with a focused examination of French environmental governance mechanisms. As climate change mitigation shifts from theoretical consensus to legislative implementation, tension emerges between top-down regulatory frameworks and bottom-up socio-economic equity. Grounded in environmental sociology and institutional theory, this study investigates how state-led sustainability mandates impact marginalized socio-economic groups. Utilizing the framework of reflexive modernization and ecological citizenship, the paper analyzes participatory mechanisms—specifically the French Citizens' Convention for Climate (Convention Citoyenne pour le Climat)—and assesses their efficacy in institutional decision-making. The findings demonstrate that while institutional innovations promote broader public consultation, systemic constraints and entrenched economic interests frequently dilute participatory outcomes. The paper argues for a paradigm shift toward "just transitions" that integrate distributive justice into statutory climate policy.