With oil prices rising to record highs in 2007 and 2008, research into the next green techonology for the automotive industry has picked up speed. The main goal of developing a new type of environmentally friendly car is to replace the regular combustion gasoline engine with a cleaner or pollution-free engine. This would increase fuel savings and reduce harmful carbon dioxide emissions. Presently, the development of hydrogen fuel cells and car batteries has not progressed as hoped. Neither technology is cost-effective and ready to go to market. That leaves hybrid and electric cars as the best options for alternative engine designs.