Overview

Withdrawal from the Paris Climate Accord

The Paris Agreement is an international climate change agreement adopted in December 2015 by nations that are parties to the United Nations Framework Convention on Climate Change. It is a legally binding international treaty aimed at combating climate change by pursuing efforts to limit global warming to 1.5 degrees Celsius. Under the agreement, each participating country submits a Nationally Determined Contribution — a self-set emissions reduction target — and updates it over time with progressively greater ambition. The United States, as one of the world's largest emitters, was widely regarded as essential to the agreement's credibility.

Executive Order 14162 stated the administration's policy to "put the interests of the United States and the American people first in the development and negotiation of any international agreements with the potential to damage or stifle the American economy." Trump has argued the agreement imposes unfair burdens on the American economy. Beyond the withdrawal itself, the executive order also sought to limit U.S. financial contributions to other countries in furtherance of mitigating climate change and adapting to climate change globally. Specifically, the U.S. Ambassador to the United Nations, Secretary of State, and Treasury Secretary were directed to immediately cease or revoke financial commitments made under the UNFCCC, and the U.S. International Climate Finance Plan was rescinded.

The order was one element of a sweeping first-day climate policy reset. Trump also issued orders aimed at boosting fossil fuels and undoing Biden-era climate initiatives, declared a national energy emergency, revoked many of Biden's executive orders on climate change, instructed agencies to roll back restrictions on offshore drilling, and issued a moratorium on new wind power projects on federal lands.

A notable legal boundary was observed, at least initially. Trump did not announce withdrawal from the underlying UNFCCC treaty, which was ratified by the U.S. Senate in the 1990s and which provided the framework under which the Paris Agreement was negotiated and signed. The executive order's language indicated this was deliberate — the U.S. would retain its right to vote in the Conference of Parties, as well as its reporting obligations under the UNFCCC, possibly because withdrawal from a Senate-ratified treaty requires a two-thirds Senate majority. That restraint, however, did not last. On January 7, 2026, the President announced the intention to withdraw the U.S. from the UNFCCC itself, along with the Intergovernmental Panel on Climate Change and dozens of other global institutions. The legal grounds for a president to unilaterally exit the UNFCCC are unclear and may elicit legal challenges.

Significance and Impact

The second U.S. withdrawal from the Paris Agreement carries far-reaching consequences for international diplomacy and global climate efforts. The United States is the world's second-largest emitter of greenhouse gases and has historically contributed the most to cumulative emissions. Its absence from the agreement is therefore not merely symbolic. The exit weakens the collective effort needed to tackle climate change and creates a leadership vacuum that other nations, particularly China, may seek to fill. Moreover, U.S. withdrawal may encourage other nations to weaken or delay their own climate commitments, citing the disengagement of one of the world's largest economies — a potential domino effect reducing overall ambition levels in climate mitigation.

The financial dimension of the withdrawal is also significant. The executive order is targeted at stopping any U.S. climate finance contributions, making the new global climate finance goal of $1.3 trillion per year by 2035, agreed upon in Baku, much harder to achieve, and directly impacting the poorest countries while degrading international trust in the effectiveness of the process. The U.S. withdrawal weakens financial support for developing nations — those most affected by climate change despite contributing the least to greenhouse gas emissions — and the decision to disengage from mechanisms like the Green Climate Fund reduces funding for mitigation and adaptation efforts, further widening global climate inequality.

The UNFCCC withdrawal announced in January 2026 added another layer of consequence. U.S. withdrawal from the UNFCCC and the IPCC will result in incomplete global emissions inventories and further constrained resources for international scientific collaboration. Over the coming years, the U.S. departure from these bodies may create ripple effects across other international conventions and treaties, affecting carbon markets and climate diplomacy.

As of the current date, the United States withdrawal from the Paris Agreement became formally effective on January 27, 2026. The withdrawal placed the U.S. alongside Iran, Libya, and Yemen as the only countries not party to the treaty.

Reactions and Debate

International reaction was swift and largely critical. The United Nations reaffirmed its commitment to the Paris Agreement and emphasized its goal of limiting global temperature rise to 1.5 degrees Celsius. The UN climate chief warned that the step back from climate cooperation would harm the U.S. economy itself, arguing that "this latest step back from global leadership, climate cooperation and science can only harm the US economy, jobs and living standards, as wildfires, floods, mega-storms and droughts get rapidly worse." Amnesty International warned that while the U.S. may no longer be a party to the Paris Agreement, it still has legal obligations to protect humanity from the worsening impacts of climate change, as confirmed by the International Court of Justice in its landmark 2025 advisory opinion.

Within the United States, the withdrawal sharpened an already polarized debate. Some members of Congress expressed strong disapproval of the decision to withdraw from the Paris Agreement, while others voiced approval for the action. Supporters of the withdrawal largely echoed the administration's framing: that the agreement imposed economic costs on American industry while imposing less stringent requirements on major competitors, particularly China. Critics countered that climate inaction would impose far greater long-term costs on the U.S. economy through climate-related damages.

The research community was divided on the emissions question, though not on the diplomatic one. Some researchers expressed concern that a U.S. withdrawal from the Paris Agreement could delay emissions reductions globally and preclude achieving the agreement's temperature goals, while other researchers held that U.S. withdrawal is unlikely to result in increased emissions on its own. On the question of whether other nations would follow the United States out of the agreement, the record so far has been reassuring in a narrow sense: as of April 2025, no other country had withdrawn from the Paris Agreement. However, analysts noted that a stagnation in ambition — countries maintaining existing pledges without increasing them — posed a serious problem independent of formal withdrawal.

Some observers drew on the experience of Trump's first withdrawal for perspective. Trump also withdrew the U.S. from the Paris Agreement during his first administration, and then as now, one of the primary impacts was to create a leadership vacuum — one that was largely filled during that earlier period by other nations, plus state, local, and business leaders. Whether a similar compensatory dynamic will emerge in response to the second withdrawal remains less certain, partly because the broader rollback of domestic U.S. climate policy has reduced the role of states and municipalities as a counterweight.

Outlook

The most significant open question concerns durability. The first withdrawal was reversed in less than a year after a change in administration; the second may prove harder to undo. The January 2026 announcement of intent to withdraw from the UNFCCC itself — if carried through — would complicate any future reentry into the Paris Agreement, since the Paris Agreement operates under the UNFCCC framework. Withdrawal from the UNFCCC entails far more profound legal and political consequences, given its status as the parent framework of the international climate regime and its near-universal ratification by the international community. It remains uncertain whether a future president could rejoin the UNFCCC, and ultimately the Paris Agreement, without significant legal and procedural obstacles.

Internationally, the repeated U.S. reversals on climate commitments have raised structural questions about the reliability of executive-only climate pledges. Because the Paris Agreement was never submitted to the Senate for ratification as a treaty, it remained vulnerable to reversal by executive order — a vulnerability that has now been exploited twice. Other major economies have signaled they intend to press forward. Several major economies, including Japan, the European Union, and South Korea, have communicated strong plans to use carbon market mechanisms to achieve their climate targets, signaling that key elements of the Paris architecture will continue to develop with or without U.S. participation.

Within the U.S., the Inflation Reduction Act's clean energy incentives remain partially intact, having survived various legislative and administrative challenges, providing some continued momentum for domestic emissions reductions even outside the Paris framework. But the cumulative effect of the withdrawal from the Paris Agreement, the cessation of climate finance, and the announced UNFCCC departure represents the most significant retrenchment from international climate engagement in the post-1992 era. President Trump has called for U.S. withdrawal from over 60 other international organizations, including many others related to climate change, biodiversity, and clean energy, calling them "wasteful, ineffective, or harmful." The full legal and diplomatic consequences of those steps remain to be seen.