The head of the World Bank urged Japan in a recent interview to develop more renewable energy sources while calling on emerging economies to get ready for a possible cutback in the U.S. central bank's stimulus program.

"Japan . . . now needs to be even more aggressive in finding ways of using renewable sources," World Bank President Jim Yong Kim told a group of news organizations from Japan and South Korea in Washington ahead of his trip to the two countries next month.

Kim played down growing criticism of Japan for backpedaling on its goal of reducing greenhouse gas emissions after mostly suspending the use of nuclear energy in the wake of the Fukushima nuclear catastrophe.