Yes. It's a matter of national interest. Because Japan is a relatively small, cut off archipelago nation with very few natural resources. It needs to be able to generate its own energy with less raw material imports or it won't have as much power as it needs. It doesn't have tons of space it can afford to pollute. Japan wants to be able to use large amounts of renewable electricity to generate tons of value that it can trade for materials it needs to build and maintain renewable energy facilities, and for food and goods. The stuff about the environment makes for really good, convenient PR and possibly revenue stream of external funding for initiatives. If Japan can game the international green system and pull out of this population nose dive without importing an unmanageable demographic collapse into itself, it will become a superpower again and have another shot at world domination, this time through imposing world peace. If it comes to our world, Pax Japonica will be a sterile, depressing, conformist utopia where we pretend to work all day, then surround ourselves with bright colourful toys to feel awake, while drinking ourselves to sleep. It will be too much civilization; business as usual.
Edit: Hey, look, somebody wrote a book with the latin thing I said as its title, whose contents I probably summarized the thesis of without even reading.
https://www.amazon.com/PAX-JAPONICA-Resurrection-Takeo-Harad...