Quote:he figured that it would be at least another 30 years even IF a major effort would be started RIGHT NOW to replace conventional engines
That's not correct. Hydrogen cars are already available in national markets. What lacks is the American will (well, except for the exemplary state of California) to build hydrogen pumps. With new markets opening up, based on improved environmental performance, it is no longer a question of "if" but "when" and the answer is often "sooner than you think".
* Toyota announced it would start selling its fuel cell car in Japan
* Honda is producing hydrogen fuel-cell cars as we speak
* DaimlerChrysler said it plans to begin limited production of a hydrogen-fuelled vehicle based on the Mercedes A-Class compact car in 2004
Early vehicles will initially be subsidised by manufacturers to attract customers. Furthermore the energy industry is also getting serious about hydrogen and experts expect a fundamental change in the world's economies based on the reduced demand for oil. Some countries are not reluctant to aim towards hydrogen as their prime source of energy.