While the world’s energy sources become less based on fossil fuels like coal, oil and natural gas, two energy forms, hydrogen and electricity, are expected to be the two dominant energy carriers for the provision of end-use energy services, in what is often referred to as a hydrogen economy. In particular, as relatively easily accessible fossil fuel supplies become scarcer or more expensive to harvest and as environmental concerns, especially climate change and the global warming that leads to it, expand and become more concerning, hydrogen is likely to become an increasingly important chemical energy carrier. Hydrogen can be viewed as a hydrocarbon fuel with no carbon, so its utilization does not contribute to climate change. The prospects for renewable energy are enhanced through the use of hydrogen energy systems in which hydrogen is an energy carrier. Thus, hydrogen energy systems allow greater use of renewable energy resources

Marc A. Rosen is a Professor at Ontario Tech University in Oshawa, Canada, where he served as founding Dean of the Faculty of Engineering and Applied Science. Dr. Rosen was President of the Engineering Institute of Canada. He is a registered Professional Engineer in Ontario, and serves as Editor-in-Chief of several journals and he was a Director of Oshawa Power and Utilities Corporation. With over 60 research grants and contracts and 900 publications, Dr. Rosen is an active teacher and researcher in sustainable energy, environmental impact, and energy technology (including renewable energy and efficiency improvement). Much of his research has been carried out for industry, and he has written numerous books. Dr. Rosen has worked for such organizations as Imatra Power Company in Finland, Argonne National Laboratory near Chicago, and the Institute for Hydrogen Systems near Toronto. Dr. Rosen has received numerous awards and honors.