Reuters: Japan’s electric power sector aims to improve carbon dioxide emissions per unit of electricity generated to around 73 percent of the 2008/09 level by the business year 2020/21, an industry association said on Friday. Hurt by the extended shutdown of a quake-hit major nuclear plant, the power sector’s CO2 emissions per kilowatt-hour were estimated to be around 0.45 kg in the 2008/09 business year that ended last month, roughly in line with the previous year’s 0.453 kg, the Federation of Power …