[en] This report first outlines the emergency of a wide-ranging action to face climate stakes: an economic cost of inaction much greater than that of action, the Paris agreement as the best available framework, the European Union as a leader in climate action, an associated mutation which can be compared with an industrial revolution, the issue of relationship between climate transition and economic growth. It outlines faced difficulties to do in ten years what has not been done during thirty years, to make the necessary and important investments, with an uncertain macroeconomic impact and a commitment to equity, a strong impact of a climate-neutral economy on public finances, a risk of inflationist configuration, and possibly insufficient instruments to address the competitiveness issue for Europe. Detailed thematic reports are provided in appendices which more precisely address specific related issues and aspects: Sobriety, Damages and adaptation, Inflation, Productivity, Competitiveness, Labour market, Capital market, Distributive stakes, Modelling, Well-being, Indicators and data