Paris Agreement (2015) — Treaty Brief

Overview

The Paris Agreement, adopted in 2015 under the United Nations Framework Convention on Climate Change (UNFCCC), is a landmark global treaty aimed at combating climate change by limiting global warming to well below 2°C above pre-industrial levels, with efforts to limit the increase to 1.5°C. It establishes a framework for all countries to undertake nationally determined contributions (NDCs) to reduce greenhouse gas emissions, enhance adaptive capacities, and foster climate resilience. Unlike previous climate treaties, the Paris Agreement emphasizes a bottom-up approach, allowing states to set their own targets while promoting transparency, regular reporting, and a global stocktake every five years to assess collective progress (Articles 3, 4, 13, 14). It also addresses financial support for developing countries and encourages technology transfer and capacity building to facilitate implementation.

Key Obligations

• Nationally Determined Contributions (NDCs): Parties must prepare, communicate, and maintain successive NDCs representing their climate action plans, with a commitment to progressively increase ambition over time (Article 4).
• Mitigation: Parties aim to achieve a balance between anthropogenic emissions by sources and removals by sinks in the second half of this century, effectively targeting net-zero emissions (Article 4.1).
• Adaptation: Parties are encouraged to strengthen resilience and reduce vulnerability to climate change impacts, integrating adaptation into national planning (Article 7).
• Transparency Framework: Parties must regularly report on their emissions and progress towards NDCs, subject to a technical expert review and multilateral consideration (Article 13).
• Global Stocktake: Every five years, Parties collectively assess progress towards the Agreement’s long-term goals, informing future NDCs (Article 14).
• Climate Finance: Developed countries shall provide financial resources to assist developing countries in mitigation and adaptation efforts, with a goal of mobilizing $100 billion annually (Article 9).
• Technology Development and Transfer: Parties commit to enhancing cooperative action on technology innovation and diffusion (Article 10).
• Capacity Building: Support is provided to developing countries to strengthen their ability to implement the Agreement (Article 11).
• Voluntary Cooperation and Market Mechanisms: Parties may engage in cooperative approaches, including internationally transferred mitigation outcomes (ITMOs), under Article 6, subject to rules ensuring environmental integrity.

Signatories and Status

The Paris Agreement has near-universal participation, with almost all UNFCCC Parties signing and ratifying the treaty, reflecting broad global consensus on the urgency of climate action. Major emitters such as the United States, China, the European Union, India, and Brazil are all signatories. The United States initially joined under the Obama administration but formally withdrew under the Trump administration, citing economic concerns, before rejoining under the Biden administration. This withdrawal and re-entry highlighted the political sensitivity around climate commitments. Some smaller states and territories have also ratified the Agreement, while a few UN member states have yet to ratify or accede. The Agreement entered into force relatively quickly due to its flexible design, requiring ratification by at least 55 Parties representing at least 55% of global emissions.

Major Controversies

• Ambition and Enforcement: The Agreement relies on voluntary NDCs without legally binding emission reduction targets, leading to criticism that it lacks enforcement mechanisms to compel states to meet their commitments. The “name and shame” approach through transparency and global stocktakes is the primary accountability tool.
• Article 6 and Carbon Markets: Negotiations over the rules governing cooperative approaches and carbon markets under Article 6 have been contentious. Disputes focus on avoiding double counting of emission reductions, ensuring environmental integrity, and the role of offsets. Delays in finalizing these rules have impeded the operationalization of international carbon trading.
• Equity and Differentiation: Developing countries argue that the Agreement’s bottom-up approach weakens the principle of common but differentiated responsibilities (CBDR), a cornerstone of earlier climate treaties. They call for greater financial and technological support from developed countries, which some developed countries view as open-ended obligations.
• Withdrawal and Political Volatility: The U.S. withdrawal in 2020 exposed vulnerabilities in the treaty’s political sustainability, raising concerns about the impact of domestic politics on international climate commitments.
• Loss and Damage: While the Agreement recognizes the importance of addressing loss and damage associated with climate impacts (Article 8), it stops short of establishing liability or compensation mechanisms, which remains a contentious issue between vulnerable countries and wealthy emitters.

Recent Developments

In the past five years, the Paris Agreement has seen several important developments:

• Enhanced NDCs: Ahead of the 2021 UN Climate Change Conference (COP26), many countries submitted updated NDCs with more ambitious targets, reflecting growing scientific urgency and public pressure.
• Glasgow Climate Pact (COP26): The 2021 conference resulted in the Glasgow Climate Pact, which urged Parties to “phase down” unabated coal power and “phase out” inefficient fossil fuel subsidies. It also advanced the operationalization of Article 6, although some rules remain unresolved.
• Climate Finance Commitments: Discussions have intensified around fulfilling and scaling up the $100 billion annual climate finance goal, with developed countries facing pressure to deliver on promises and increase support for adaptation and loss and damage.
• Increased Focus on Adaptation and Resilience: The Agreement’s adaptation provisions have gained prominence, with new initiatives and funding mechanisms aimed at helping vulnerable countries cope with climate impacts.
• Implementation Challenges Amid Global Crises: The COVID-19 pandemic and geopolitical tensions have complicated climate diplomacy and implementation, but have also spurred green recovery plans in some regions.

Why It Matters Now

The Paris Agreement remains the foundational framework for global climate governance, providing a platform for collective action amid accelerating climate impacts. Its flexible yet inclusive design enables broad participation but requires renewed political will and enhanced ambition to meet the 1.5°C target. As climate-related disasters intensify and scientific warnings grow more urgent, the Agreement’s mechanisms for transparency, finance, and cooperation are critical for coordinating international efforts and holding states accountable.