€500 million disappeared from the climate mission's budget in one day, while €783 million was frozen. This double measure, announced on September 11th, 2026, represents the largest budget cut ever applied to an environmental transition program in France. At the heart of the debate, decision-makers seek to contain the public deficit which threatens to reach critical levels by 2026, but the budget cut raises important questions about the country's ability to meet its international climate commitments.