A possible withdrawal of the USA from the UN Framework Convention on Climate Change (UNFCCC) would put the Climate Change Secretariat in financial difficulties. If the US, the largest contributor to the convention to date, were to leave, as announced by President-elect Donald Trump, the UN Climate Change Secretariat would lose more than a quarter of its annual core budget, i.e. around $20 million. This is according to internal calculations by UN Climate Change, which the UN has confirmed to Table.Briefings.