National Public Radio: Japan’s government and Japanese companies are touting efforts to make their country one of the most energy-efficient, low-carbon places in the world. But some critics dismiss the publicity as “greenwash” that paints a deceptive picture of Japan’s environmental status. The country’s cabinet approved a trial plan Wednesday to trade carbon credits in an effort to lower emissions and fight global warming. And at a show at the G-8 Summit in Hokkaido this month, plug-in cars, …