"A number of international cities with large urban bus fleets have formed an alliance on hydrogen buses. These cities represent leading adopters of new bus technologies on their respective continents and plan to act as leaders in the move to cleaner fuels for urban public transit.
Logo needs to be designed that should reflect the fact that it is: An international organisation that will promote the development & use of hydrogen as public transport. This logo will be used on a variety of mediums, including print/web, and possibly the side of some buses. So needs to be strong, distinctive, clean & flexible."
Based on simple forms and atomic structure of Hydrogen. Clean and readable type, specially at small sizes.
Say what you feel about this logo, be constructive. I'm happy for being so simple and clear. Your feedback is important.