Queen Mary reviews troops in England, and charcoal fuels buses in Japan

The video discusses the Royal regiment with Queen Mother Mary as their Colonel in chief. It then shifts focus to Tokyo, Japan, where due to the necessity of gasoline economy and the need to import oil, the city has started running 3000 buses on charcoal as a motor fuel alternative.

What is the role of charcoal in Tokyo's transportation system as described?

How does Tokyo plan to address the issue of fuel for its buses?