This project embeds sustainability concepts into Principles of Macroeconomics (ECON 204), a high-enrollment principles course taken by hundreds of students across disciplines each year. Students will leave understanding the environment as a precondition for economic stability — and macroeconomic policy as a tool for addressing the climate crisis. Concretely, this means developing a new unit on financial and environmental crises, short integrative inputs across existing units — from monetary policy to public debt — and a course introduction that situates the economy within planetary boundaries. By reaching students before they specialize, this approach can shape their understanding of the relationship between economic systems and sustainability.