Hydrogen will be used for the first time to power the Olympic torch during its journey through Japan, organizers said on Monday, as part of Tokyo 2020’s efforts to hold an environmentally friendly Games.

Source: https://www.reuters.com/article/us-olympics-2020-torch/tokyo-2020-to-power-olympic-torch-with-hydrogen-for-first-time-idUSKBN1ZQ0D5