UNFCCC vs Paris Agreement: The Framework and Its Operating Treaty

The United Nations Framework Convention on Climate Change (UNFCCC), 1992 is the parent treaty of the global climate regime: it sets the objective, principles and institutions. The Paris Agreement, 2015 is a treaty under the UNFCCC that makes the regime operational for the period after 2020, with a temperature goal and nationally determined contributions (NDCs) from all parties. The UNFCCC is the constitution; Paris is the working rulebook. In between came the Kyoto Protocol, 1997, which bound only developed countries.

1. The UNFCCC

The UNFCCC was adopted on 9 May 1992, opened for signature at the Rio Earth Summit, and entered into force on 21 March 1994; it has near-universal membership, and India ratified it in 1993. Its objective (Article 2) is to stabilise greenhouse gas concentrations 'at a level that would prevent dangerous anthropogenic interference with the climate system'. Its principles (Article 3) include equity, common but differentiated responsibilities and respective capabilities, the precautionary approach and sustainable development. It divides parties into Annex I (industrialised countries and economies in transition), Annex II (developed countries with finance obligations) and non-Annex I (developing countries, including India). Its commitments (Article 4) are mostly general: inventories, national programmes, cooperation, and for Annex I a non-binding aim to return emissions to 1990 levels. It created the Conference of the Parties (COP), the secretariat in Bonn and subsidiary bodies. The Kyoto Protocol (1997; in force 2005) added binding reduction targets for Annex I countries only.

2. The Paris Agreement

The Paris Agreement was adopted at COP21 on 12 December 2015 and entered into force on 4 November 2016; India ratified it on 2 October 2016. Its key features are:

• Article 2: hold warming well below 2°C and pursue efforts to limit it to 1.5°C; increase adaptive capacity; make finance flows consistent with low-emission development;
• Article 4: every party must prepare, communicate and maintain successive NDCs, each a progression reflecting its highest possible ambition, updated every five years; the obligation is procedural, not to achieve the NDC;
• Article 6: cooperative approaches and carbon markets; Article 7 adaptation; Article 8 loss and damage; Article 9 finance from developed countries;
• Article 13: an enhanced transparency framework for all; and Article 14: a global stocktake every five years (the first concluded at COP28, 2023).

COP29 (Baku, 2024) set a new collective quantified goal of at least USD 300 billion a year by 2035. The United States withdrew for a second time, effective January 2026. India submitted NDCs in 2015 and 2022, and approved its 2035 NDC in March 2026 (a 47 per cent cut in emission intensity from 2005 levels and 60 per cent non-fossil power capacity), alongside its net zero by 2070 goal.

3. Key Differences

4. Relationship and Significance

Only UNFCCC parties may join Paris, and the COP serves as the meeting of the Paris parties (CMA). Paris keeps the UNFCCC principles but reinterprets CBDR-RC 'in the light of different national circumstances', moving away from the rigid Annex split of Kyoto. The ICJ advisory opinion of July 2025 treated both as sources of legal obligation and held that NDCs must reflect highest possible ambition consistent with the 1.5°C goal. In India, M.K. Ranjitsinh v. Union of India (2024) referred to India's commitments under both in recognising a right against climate change.

5. Related Topics and Provisions