The author covers the current status (at least to 2003) of hydrogen as a fuel source in general and as a tool for reducing greenhouse gases. Seem very detailed and broad, though somewhat repetitive - as though the chapters were taken from papers he had written previously, but had missed a few editing opportunities to connect them. Overall, though, a good read. Now I need to do research to see how well his predictions for the future are turning out in the last ten years. Ps: for the short term (20 years) the cheapest solution to reducing greenhouse gases is to upgrade or replace dirty energy (coal generation of electricity) and adopt policies to force the transport system to become cleaner (as in Europe). ( )

This book couldn't have come out at a more timely moment, just when the hydrogen hype was hitting it's peak. Romm calls for a more reasonsed approach to hydrogen, not seeing it as a panacea, and calling for those who would overstate its potential to consider it more critically and rationally. That sort of advice can never be misguided. ( )