The Organisation for Economic Co‑operation and Development (OECD) is a multi‑disciplinary inter governmental organisation, tracing its roots back to the post‑World War II Marshall Plan. Today, it comprises 35 member countries and the European Commission committed to democratic government and the market economy, with the major emerging economies increasingly engaged directly in the work.The Environment Directorate of the OECD helps countries design environmental policies that are both economically efficient and effective at achieving their environmental objectives.The Environment Directorate provides policy