Japan is in a unique position to help promote sustainable development in Asia and in developing countries in the area of solar power, an influential U.S. environmental pundit said in an interview.

"One of the things Japan can do, is in some ways ideally positioned to do, is to launch an energy Marshall Plan for the developing countries of Asia based around solar energy," said Lester Brown, president and founder of the Earth Policy Institute in Washington.

"There are roughly 2 billion people in the world without access to electricity, and maybe 1 billion (of them are) in Asia," he said. "So this would be a great time and a great way for Japan to bring its industrial capabilities and its technological leadership to bear."