How Japan could reach carbon neutrality by 2050

"For Japan to reach its 46 percent emissions-reduction target by 2030, it would need to eliminate about 500 MtCO2e. This could be done at an average cost savings of $34 per metric ton of carbon dioxide equivalent (tCO2e) over the next decade because the required technologies are already mature.

The buildings sector would be the fastest to decarbonize, reducing emissions 55 percent, at a cost savings of $57 per tCO2e, by installing better insulation and switching to electric heat pumps instead of fossil-fuel boilers."