World output will cool to 2.9% in 2025 and 2026 from 3.3% last year, the Paris-based OECD said in a report Tuesday, with the U.S. among the worst hit.

Global economic growth is set to be slower this year largely because of Donald Trump's US tariffs, according to a leading international policy group. Worldwide growth is now expected to slow to a "modest" 2.9%, down from a previous forecast of 3.1%, said the Organization for Economic Co-operation and Development (OECD).