First, an expanding G20 will inject fresh air into global negotiations, which too often are split along outdated lines. As US President Barack Obama observed at the United Nations last September, effective multilateral diplomacy is often stifled by obsolete bloc politics inherited from the Cold War.
The G20, however, includes not only the advanced market democracies, but also prominent members of the Group of 77 (G77). By placing leaders of major developed and developing countries side by side at the same high table, the G20 increases the possibilities for diplomatic breakthroughs.
Such informal settings allow statesmen to strike up a personal rapport with their counterparts and bargain pragmatically across issue areas, rather than just playing to the galleries. Over time, obsolete alignments may yield to a more dynamic diplomacy, in which shifting coalitions of interest form to advance practical cooperation against global challenges.
Second, the G20 can encourage rising powers to assume greater global leadership in return for a bigger voice in shaping the world order. Today, the world expects China and other emerging players to help solve shared problems from climate change to financial instability to nuclear proliferation. But today's emerging powers rightly insist on being "rule-makers", not simply "rule-takers". The G20 provides a setting to advance both goals. It can anchor emerging powers as pillars of world order, while giving them a platform to influence the direction of global rules and institutions.
Third, the G20 can give tired international organizations - and particularly the United Nations - some healthy competition. Certainly, the G20 will never replace the UN, which has unequalled universality, legitimacy and technical capacity.
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