11.1 International climate agreements and negotiations

History of Climate Agreements

Early International Efforts

The United Nations Framework Convention on Climate Change (UNFCCC), adopted at the 1992 Rio Earth Summit, was the first major international framework for addressing climate change. It recognized that global cooperation was necessary and established the principle that countries share "common but differentiated responsibilities," meaning all nations have a role to play, but wealthier, historically higher-emitting countries should lead.

The Kyoto Protocol, adopted in 1997, built on the UNFCCC by introducing legally binding emission reduction targets for developed countries (listed as "Annex I" parties). Key features included:

• A target of reducing emissions by an average of 5% below 1990 levels during the first commitment period (2008–2012)
• Market-based flexibility mechanisms to help countries meet targets cost-effectively: emissions trading, the Clean Development Mechanism (CDM), and Joint Implementation (JI)
• No binding targets for developing countries, reflecting the differentiated responsibilities principle

The Copenhagen Accord of 2009 was supposed to produce a successor to Kyoto but fell short of a binding deal. Instead, it shifted toward voluntary pledges and was the first agreement to acknowledge that both developed and developing countries needed to act. Many view Copenhagen as a disappointment in its immediate results, but it laid the groundwork for the approach that would eventually define the Paris Agreement.

Modern Climate Agreements

The Paris Agreement, adopted in 2015 at COP21, marked a turning point. Unlike Kyoto's top-down binding targets for only developed nations, Paris used a bottom-up approach where every participating country submits Nationally Determined Contributions (NDCs) outlining its own climate targets. Core goals include:

• Limiting global average temperature rise to well below 2°C above pre-industrial levels, with efforts to keep it to 1.5°C
• A global stocktake every five years (first completed in 2023) to assess collective progress and ratchet up ambition
• A "ratchet mechanism" requiring each new round of NDCs to be more ambitious than the last

Since Paris, negotiations have focused on implementation details:

• Climate finance: The Green Climate Fund and debates over scaling up financial commitments (the original $$100 billion per year target by 2020 was not met on time)
• Technology transfer: The Climate Technology Centre and Network helps developing countries access clean technologies
• Adaptation: National Adaptation Plans help vulnerable countries prepare for climate impacts already underway
• Loss and damage: At COP27 (2022), countries agreed to establish a fund for loss and damage, addressing climate impacts that go beyond what adaptation can handle

Evolution of Negotiation Approaches

The negotiation process itself has changed significantly over three decades:

• Science has taken a more central role. IPCC assessment reports directly inform target-setting and urgency. The IPCC's 2018 Special Report on 1.5°C was particularly influential in sharpening the Paris temperature goals.
• Non-state actors now have a seat at the table. Cities, businesses, and civil society organizations participate through platforms like the Marrakech Partnership for Global Climate Action. This reflects a recognition that national governments alone can't drive the transition.
• Transparency and accountability have been formalized. The Paris Agreement's Enhanced Transparency Framework requires all countries to regularly report emissions data and progress toward their NDCs, creating a system of peer review even without strict enforcement.

Provisions of Climate Agreements

Emission Reduction Targets

The approach to targets has evolved considerably:

Kyoto Protocol set legally binding, top-down targets for developed countries only. The benchmark was an average 5% reduction below 1990 emission levels during 2008–2012. Developing countries had no binding obligations, which became a major point of contention (the U.S. Senate cited this asymmetry as a reason for not ratifying).

Paris Agreement replaced this with a universal but voluntary system. Every country submits NDCs based on its own national circumstances. The agreement doesn't prescribe specific numbers for individual countries but sets the collective temperature goals (well below 2°C, pursuing 1.5°C). Countries are expected to update and strengthen their NDCs every five years.

Flexibility Mechanisms

Both major agreements include mechanisms to make emission reductions more cost-effective:

Under the Kyoto Protocol:

• Emissions trading allowed Annex I countries to buy and sell emission allowances
• The Clean Development Mechanism (CDM) let developed countries earn emission credits by funding reduction projects in developing countries
• Joint Implementation (JI) enabled developed countries to collaborate on reduction projects among themselves

Under the Paris Agreement:

• Article 6 establishes cooperative approaches for voluntary international carbon market mechanisms
• A new Sustainable Development Mechanism is designed to replace the CDM with stronger environmental integrity rules and broader participation

Support for Developing Countries

Climate agreements recognize that developing countries need financial and technical support to both reduce emissions and adapt to climate impacts. Three pillars of support exist:

Climate finance: Developed countries committed to mobilizing $100$ billion per year by 2020 for developing nations. This target was not met on schedule, eroding trust in negotiations. The Green Climate Fund is the primary multilateral channel, funding both mitigation and adaptation projects. At COP29 (2024), a new collective finance goal was set at $300$ billion per year by 2035.

Technology transfer: The Technology Mechanism and Climate Technology Centre and Network help developing countries access and deploy clean energy and adaptation technologies.

Capacity building: The Paris Committee on Capacity-building and the Capacity-building Initiative for Transparency help countries develop the institutional ability to track emissions, report progress, and design effective climate policies.

Challenges to Climate Agreements

Political and Sovereignty Issues

National sovereignty is one of the biggest friction points. Countries are reluctant to let international agreements dictate their energy and economic policies. Domestic politics compound this: fossil fuel industry lobbying, electoral cycles, and shifting government priorities all affect negotiating positions.

The free-rider problem is a persistent challenge. Because the climate is a global commons, any single country can benefit from others' emission reductions without contributing its own. This creates an incentive to let others bear the costs. Early resistance from major emitters to accept binding targets illustrates this dynamic.

Short-term political cycles also clash with the long-term nature of climate change. Politicians focused on the next election may deprioritize policies whose benefits won't be felt for decades. The U.S. withdrawal from the Paris Agreement under the Trump administration (2017) and subsequent re-entry under Biden (2021) is a clear example of how changes in government can whipsaw climate commitments.

Economic and Development Disparities

Tensions between developed and developing countries run through every negotiation. Developed nations are responsible for the majority of historical cumulative emissions, but rapidly growing economies like China and India are now among the largest annual emitters. This creates disagreements over who should bear the greatest burden.

Developing countries argue they need room to grow their economies and expand energy access for their populations. India, for example, has emphasized that hundreds of millions of its citizens still lack reliable electricity. Stringent emission caps, without adequate financial support, could lock developing nations into poverty. This is why climate finance and technology transfer provisions are not just add-ons but central to getting broad participation.

Implementation and Effectiveness Challenges

Even when countries agree to targets, a gap often exists between commitments on paper and action on the ground. Domestic policies may be insufficient to meet international pledges, and the Paris Agreement lacks strong enforcement mechanisms for non-compliance. The main lever is transparency and peer pressure, not penalties.

The consensus-based decision-making process at UNFCCC negotiations means any single country can block progress. This often leads to watered-down language in final agreements, as negotiators seek the lowest common denominator that everyone can accept.

Climate skeptics have also exploited scientific uncertainties to argue for delay, though the scientific consensus on human-caused warming (reflected in successive IPCC reports) has grown overwhelming. The remaining uncertainties are about the precise magnitude and timing of impacts, not whether climate change is happening.

Stakeholders in Climate Negotiations

Government and Intergovernmental Actors

National governments are the primary negotiating parties. Major emitters and economic powers (the G20 accounts for roughly 80% of global emissions) have outsized influence on outcomes. Each government must balance international commitments with domestic political realities.

Intergovernmental organizations provide the institutional backbone:

• The UNFCCC Secretariat organizes the annual Conference of the Parties (COP) and manages the negotiation process
• The World Meteorological Organization (WMO) and UN Environment Programme (UNEP) co-founded the IPCC, which provides the scientific assessments that underpin negotiations

Non-Governmental and Civil Society Organizations

NGOs participate as observers and advocates, pushing for stronger action and holding governments accountable. Environmental organizations like Greenpeace and WWF campaign publicly, while think tanks provide detailed policy analysis that shapes negotiating positions.

Indigenous peoples and local communities bring perspectives often missing from high-level talks. Groups like those represented through the Arctic Council highlight how climate change disproportionately affects vulnerable populations and contribute traditional ecological knowledge to adaptation discussions.

Private Sector and Scientific Community

Business and industry stakeholders play a dual role. Renewable energy companies and green technology firms advocate for ambitious climate targets that expand their markets. At the same time, fossil fuel industry representatives lobby to slow the transition. Both groups send delegations to COP meetings and influence national positions.

The IPCC is the most important scientific body in climate negotiations. Its assessment reports (the Sixth Assessment Report was completed in 2023) synthesize thousands of studies and directly inform the targets and timelines that negotiators debate. National scientific academies also shape their countries' positions.

Emerging Voices in Climate Diplomacy

Youth movements have become a significant force. The Fridays for Future movement, sparked by Greta Thunberg's school strikes beginning in 2018, raised public pressure on negotiators. Youth delegates participate formally through the YOUNGO constituency within the UNFCCC process.

Subnational actors increasingly operate in parallel to national governments. The C40 Cities Climate Leadership Group coordinates climate action among major world cities. In the U.S., states like California have pursued climate policies more ambitious than federal targets, demonstrating that subnational leadership can fill gaps when national action stalls.