সঠিক উত্তর হচ্ছে: ১৯৭২
ব্যাখ্যা: 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: un.org