Business Green: Japan’s policies to reduce greenhouse gas emissions by 2020 will cost $515bn over the next decade, according to a government panel report released yesterday. In June, the nation set a target to cut emissions by 15 per cent below 2005 levels by 2020. The largest outlay of the estimated $515bn lies in the $126bn needed to promote electric and other eco-friendly cars, according to the report from a subcommittee of the Advisory Committee for Natural Resources and …