The US has withdrawn from 66 organisations, many focused on environmental and climate topics, including UN bodies the UN Framework Convention on Climate Change (UNFCCC) and the Intergovernmental Panel on Climate Change (IPCC).
The UNFCCC now has 198 parties. It was established in 1992, and is the overarching global framework for climate action, encompassing the annual Cop climate summits and the 2015 Paris climate agreement. The latter has 194 signatories, after President Donald Trump pulled the US out in January 2025. Given the scale of UNFCCC membership, events such as Cops offer a rare opportunity for almost-total multilateralism.
The IPCC, which was established in 1988, counts 194 countries as members. It assesses science related to climate change. Its reports collate best-available science and research and are viewed as the primary authority on climate change science.
The US is also leaving other UN bodies and non-governmental organisations (NGOs) including the International Renewable Energy Agency (Irena) and the International Solar Alliance.
"Many international organizations now serve a globalist project rooted in the discredited fantasy of the 'End of History', the White House said "These organizations actively seek to constrain American sovereignty.
"We will not continue expending resources, diplomatic capital, and the legitimizing weight of our participation in institutions that are irrelevant to or in conflict with our interests", it said.
The US did not attend Cop 30 in November, although several US governors and regional leaders did. The US decision to leave the UNFCCC "is a strategic blunder that gives away American advantage for nothing in return," said non-profit WRI's director of the US segment David Widawsky. "Walking away doesn't just put America on the sidelines — it takes the US out of the arena entirely. American communities and businesses will lose economic ground as other countries capture the jobs, wealth, and trade created by the booming clean-energy economy."
California governor Gavin Newsom (D) made a similar point at Cop 30, noting China's power in clean energy and electric vehicle markets. Trump "simply doesn't understand how enthusiastic President Xi [Jinping] is today that the Trump administration is nowhere to be found at Cop 30", Newsom said.
The US decision is "regrettable and unfortunate", said EU climate commissioner Wopke Hoekstra. He reiterated the bloc's commitment to climate research, co-operation and action — which it pledged, along with China when the US left the Paris accord in January 2025.
Bloomberg Philanthropies in January 2025 said it and other US bodies would ensure the US met funding and reporting obligations to the UNFCCC. This is not the international climate finance often discussed at UNFCCC talks, but funding that helps the climate body operate and host events such as Cops.

