Answer:
North Korea
Explanation:
All of the listed countries are causing damage to the environment, but Japan, South Korea, and China are also trying to fix the problem, while North Korea don't seem to be bothered about it. South and Japan in particular are investing a lot in renewable energy sources in order to decrease the emission of greenhouse gases, as well as having strict laws about protecting the environment. China is one of the biggest polluters in the world, but at the same time is putting lot of efforts lately to improve the well being of the environment, having big success in making the deserts in the north of the country covered with greenery. North Korea is another case. It is a country that in order to be able to sustain itself uses everything that it can, usually meaning that the environment is heavily damaged, and in order to not lose any of the very important finances for their existence, they don't spend anything to protect the environment.
