A proposed large waste incinerator called "Thermo-sur-Seine" has sparked concerns among residents and local associations in Vitry-sur-Seine, located in the Val-de-Marne department. On July 16, they gathered in front of the Town Hall to protest against the project, expressing their opposition. The incinerator is designed to generate heat for homes and public buildings, including hospitals, in Paris and the surrounding "petite couronne" area, which refers to the inner ring of suburbs surrounding the city. Supporters of the project argue that it will help reduce carbon emissions by contributing to the decarbonization of the Île-de-France heat network. The City of Paris, which launched the initiative, describes the facility as "a pillar of the energy transition of the network," emphasizing its role in moving toward more sustainable energy sources. However, the project has faced criticism over potential health and environmental impacts, with local groups raising concerns about air quality, pollution, and the long-term effects on public health. The debate over the Thermo-sur-Seine project highlights the tension between environmental goals and public health concerns. While the city and its partners see the incinerator as a necessary step toward reducing reliance on fossil fuels, residents are worried about the possible consequences of having such a facility in their area. The controversy underscores the complex challenges involved in transitioning to greener energy systems in densely populated regions. As the discussion continues, local authorities and project proponents have emphasized the need for transparency and public dialogue. They claim that the facility will comply with strict environmental regulations and that measures will be taken to minimize any negative impact. However, opponents insist that more independent assessments and community involvement are needed before any final decisions are made. The outcome of this debate could set a precedent for similar projects in other parts of the Île-de-France region.