The United Nations matters to all people, everywhere. If we are to manage global catastrophic risks - from climate change to nuclear weapons - we desperately need an effective UN that is open and accountable to the people it serves. A UN Parliamentary Assembly would be a positive step in this direction. It would send a strong message about the need to involve stakeholders in the work of the UN, and help to boost the organisation’s legitimacy and efficacy. The UN was created for “we the peoples”. It is only right that people around the world are able to engage meaningfully with its work.