পরিবেশ ইস্যু নিয়ে জাতিসংঘের প্রথমবারের মত বড় কোন সম্মেলন কবে অনুষ্ঠিত হয়?

The United Nations Conference on the Human Environment (also known as the Stockholm Conference) was an international conference convened under United Nations auspices held in Stockholm, Sweden from June 5-16, 1972. It was the UN's first major conference on international environmental issues, and marked a turning point in the development of international environmental politics. Source: https://sustainabledevelopment.un.org/milestones/humanenvironment