Many of the pressing policy challenges confronting the world's countries and peoplesclimate change, pandemics, food and water scarcity, terrorism, financial meltdown-are international in origin and nature, global in scope and effects, and require concerted multilateral action led by the major powers. However, the responsibility for making policy and the authority to mobilize the requisite coercive resources to tackle the threats remain vested in sovereign states. Absent a world government, the order, stability, and predictability in international transactions comes from global governance operating as a patchwork of authority structures which produce generally adhered-to norms to regulate behavior, and layers of mechanisms to punish noncompliance. 1 The architecture of global governance consists of international and regional intergovernmental organizations; a 'soft' layer of informal general-purpose groupings of states-such as the old G7, new G20, and the BRICS (Brazil, Russia, India, China, and South Africa) groupings; as well as transnational civil society and market actors that have exploded in numbers, role, and influence. In this global governance architecture, the United Nations (UN) forms the inner core of the mandated multilateral machinery. It was established to provide a degree of predictability and order in a world in constant flux. The organization is at once the symbol of humanity's collective aspirations for a better life in a safer world for all, a forum for negotiating the terms of converting these collective aspirations into a common program of action, and the principal international instrument for realizing aspirations and implementing plans to achieve their ends. The UN's primary function is to maintain international peace and