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World leaders have gathered in Osaka, Japan for the latest G20 summit meeting. What is the G20, where did it come from, and why is it unable to meet the world's biggest challenges?
That's the moment when the G20 group of countries first became important. The G20 responded effectively to the financial crisis, because it threatened all these countries at the same time and in a big way. Today, the G20 countries account for about 80% of the global economy and two-thirds of the world's population.