Out of the thick political fog produced by Japan's G8 Summit in Hokkaido emerged one key pledge: the world's second-largest economy has announced a 60-80 percent cut in greenhouse gases by 2050, one of the most ambitious national targets. The pledge has since come under intense scrutiny, particularly over the telling lack of mid-term targets and deliberate fudging on the starting or base year for cuts – 1990 or 2008? But one thing remains very clear: nuclear energy will shoulder much of the burden of the country's climate-change strategy.