What is "Agenda-21" about?
1. An agenda related to military exercises between US and India
2. An agenda related to the Nuclear deal between India and Russia
3. An agenda related to the military and nuclear deal between Ukraine and the European Union
4. An agenda related to climate change, biodiversity, forestry etc.

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Agenda 21 is a comprehensive action plan developed by the United Nations for addressing various environmental and sustainable development challenges.

The growing focus on environmental issues within the arena of global politics was firmly consolidated at the United Nations Conference on Environment and Development held in Rio de Janeiro, Brazil, in June 1992. This was also called the Earth Summit. The summit was attended by 170 states, thousands of NGOs and many multinational corporations. The Rio Summit produced conventions dealing with climate change, biodiversity, and forestry, and recommended a list of development practices called ‘Agenda 21’.