What is Rio+20 Conference, often mentioned in the news?

The correct answer is A. Rio+20 was the United Nations Conference on Sustainable Development, held in Rio de Janeiro in June 2012, twenty years after the 1992 Earth Summit. Its outcome document, "The Future We Want", launched the process that led to the Sustainable Development Goals adopted in 2015.

Why the others are wrong:

• B: WTO Ministerial Conferences are a separate series, held in places like Singapore, Doha, Bali and Nairobi. They deal with trade rules, not sustainable development.
• C: The IPCC is a scientific body set up by WMO and UNEP. It does not hold a conference named Rio+20. Its climate negotiations happen under the UNFCCC's Conferences of the Parties (COPs).
• D: The Conferences of the Parties to the Convention on Biological Diversity are biennial meetings on biodiversity. Rio+20 was not one of them.

The concept here is the Rio process: the 1992 Earth Summit produced Agenda 21, the CBD, the UNFCCC and the UNCCD, and Rio+20 reviewed that progress. For Mains GS-III, it is a useful anchor for the shift from environment-only thinking to integrated sustainable development.

Trap: Aspirants see "Rio" and link it to the CBD, because the CBD was signed at the 1992 Earth Summit. Rio+20 is a UN summit on sustainable development, not a biodiversity meeting.