Business Green: A number of global warming experts — including China’s top climate envoy — have criticised Japan for not going far enough in its recently unveiled targets to reduce emissions. Japan this week set a target reduction of 15 per cent of emissions from 2005 levels by 2020 — an amount that equates to eight per cent below 1990 levels, far less than the 20 per cent pledged by the EU. “I do not believe it is a number that is close to what Japan needs to do and should do,” said Yu …