Consider the following pairs:

Terms	Origin sometimes seen in the news
1. Annex—I Countries	Cartagena Protocol
2. Certified Emissions Reductions	Nagoya Protocol
3. Clean Development Mechanism	Kyoto Protocol

Which of the pairs given above is/are correctly matched?

The correct answer is 3 only — only Pair 3 (Clean Development Mechanism → Kyoto Protocol) is correctly matched.

Let us analyze each pair carefully to understand why:

Pair 1: Annex-I Countries → Cartagena Protocol

This pair is incorrectly matched. The term Annex-I Countries does not originate from the Cartagena Protocol. Annex-I Countries is a classification that comes from the United Nations Framework Convention on Climate Change (UNFCCC), adopted in 1992. These are the industrialized (developed) nations and economies in transition that are listed in Annex I of the UNFCCC, and they have specific emissions reduction commitments, especially under the Kyoto Protocol. The Cartagena Protocol on Biosafety (2000), on the other hand, is a supplementary agreement to the Convention on Biological Diversity (CBD) that deals with the safe handling, transport, and use of Living Modified Organisms (LMOs) — it has nothing to do with Annex-I country classifications.

Pair 2: Certified Emissions Reductions → Nagoya Protocol

This pair is also incorrectly matched. Certified Emissions Reductions (CERs) are carbon credits generated under the Clean Development Mechanism (CDM), which itself is a part of the Kyoto Protocol. When a developing country project reduces greenhouse gas emissions, it earns CERs that developed countries can purchase to meet their own emissions targets. The Nagoya Protocol (2010), in contrast, is a supplementary agreement to the Convention on Biological Diversity (CBD) that focuses on Access to Genetic Resources and the Fair and Equitable Sharing of Benefits (ABS) — it has no connection whatsoever to carbon credits or emissions.

Pair 3: Clean Development Mechanism → Kyoto Protocol ✓

This pair is correctly matched. The Clean Development Mechanism (CDM) is explicitly defined under Article 12 of the Kyoto Protocol (1997). It is one of the three "flexibility mechanisms" of the Kyoto Protocol (the other two being Joint Implementation and International Emissions Trading). The CDM allows developed (Annex-I) countries to invest in emission-reduction projects in developing countries and earn Certified Emissions Reductions (CERs) in return, helping them meet their binding emissions targets under the Kyoto Protocol. This is a well-established and direct origin — CDM is inseparable from the Kyoto Protocol framework.

Summary Table:

Therefore, only Pair 3 is correctly matched, making "3 only" the correct answer.