India also played a prominent role in articulating the economic concerns of developing countries in such UN-sponsored conferences as the triennial UN Conference on Trade and Development and the 1992 Conference on the Environment and Development in Rio de Janeiro. It has been an active member of the Group of 77, and later the core group of the G-15 nations. Other issues, such as environmentally sustainable development and the promotion and protection of human rights, have also been an important focus of India's foreign policy in international forums.