U.S. Withdrawal From Paris Climate Accord Takes Effect

Overview

• The withdrawal took effect on January 27, 2026, one year after the United States formally notified the UN.
• UN assessments project roughly 0.1°C additional warming from the U.S. exit, with current policies tracking about 2.8°C by 2100.
• As the second‑largest emitter, the United States sheds Paris obligations and federal participation in upcoming climate negotiations.
• Funding shortfalls are expected, with support for adaptation in poorer countries flagged as particularly vulnerable.
• The administration has also signaled plans to leave the UNFCCC and IPCC, spurring calls for EU leadership as U.S. states and cities maintain climate engagement.