Japan is not tearing down any nuclear plants, we are building more. Nobody wants to increase carbon emissions here, it’s just that we have growing demand that cannot be met without importing. A huge chunk of energy in Japan is imported but we are slowly adding renewables and more nuclear. It’s silly to think that a country WANTS to depend on imports for a majority of its energy needs. The energy department has a forecast to 2030 somewhere out there (a pdf) and the goal is to reduce imports while putting more into renewables.