Tucked into the tail end of the decade was Friday's release of the Tokyo Metropolitan Government's "Zero Emission Tokyo Strategy," which unveils a blueprint for achieving net zero carbon dioxide emissions by 2050.

In the strategy, the Tokyo Metropolitan Government states that it recognizes a climate crisis and that the city "will implement concrete policies and effective measures," such as making all buildings in Tokyo zero-emissions buildings and making all cars driven here completely carbon-free by the middle of the century.

The road map also sets a midterm target of 2030 for having 30 percent of Tokyo's energy generated by renewable sources, bolstered by the installation of 1.3 gigawatts of solar power equipment (equivalent to the energy consumed by around a million households each year) by the end of the 2020s.