News blog 14 Sep 2012 | 19:17 BST | Posted by Declan Butler | Category: Earth, environment & ecology, Energy, Fukushima, Industry, International Relations, Natural disasters, Policy A week can be a long time in politics, so today’s announcement by the Japanese government that it intends to phase out its 50 remaining nuclear reactors by around the 2030s is perhaps much less of a certainty than it might at first appear.