The 1992 UNFCCC serves as the international structure for efforts by 198 countries to slow the rate of rising climate pollution. It has universal participation. The U.S. was the first industrialized nation to join the treaty following its ratification under former President George H.W. Bush — and it will be the only nation ever to leave it.

Among the groups from which the U.S. withdrew are two prominent climate organizations — the Intergovernmental Panel on Climate Change (IPCC) and U.N. Framework Convention on Climate Change (UNFCCC).

That included dangerous heat waves, which the WWA said were the world's deadliest extreme weather events in 2025. The researchers said some of the heat waves they studied in 2025 were 10 times more likely than they would have been a decade ago due to climate change.

When engineers and planners design roads, bridges and dams, they rely on hydrological models intended to protect infrastructure and communities from 50- and 100-year floods. But as climate change increases the frequency and severity of floods,

The withdrawal stems from Executive Order 14199, issued on February 4, 2025, in which Mr Trump pledged to cut funding to certain United Nations bodies and reassess US support for

U.S. President Donald Trump's withdrawal from the United Nations climate framework marks a significant escalation of anti-climate policy.

On Wednesday, President Trump announced he was withdrawing the U.S. from the principal treaty for international cooperation on climate change.