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World leaders are running out of options to revive a sickly global economy.
After coasting for years on support from their central banks, top economies are struggling to come up with viable steps to reshape an increasingly dour outlook. They are also facing a host of newer troubles, from political problems to security crises, clouding the horizon and raising doubts about their ability to keep the world economy from falling into a long-term funk.
Leaders from the Group of 20 largest economies confronted that reality as they began an annual summit in Turkey on Sunday. China’s slowdown and turmoil across emerging markets...