NEW DELHI — The U.S.-sparked global financial meltdown is just the latest sign that the world is at a defining moment in history. Given the global ace of political, economic and technological transformation witnessed the last two decades, the next 20 years are likely to bring equally dramatic change.

Yet the world cannot remain saddled with outmoded, ineffective institutions and rules. With the rise of non-Western economic powers and the emergence of nontraditional challenges — from global warming to energy and food crises — the institutional structure and mandate need to advance. That demands far-reaching institutional reforms, not the halfhearted and desultory moves seen thus far, geared mostly at establishing ways to improvise and thereby defer genuine reforms.

A classic case is the Group of Eight's "outreach" initiative, which brings some emerging economies into a special outer tier designed for show.