Recent automotive headline grabbers include the FCX Clarity fuel cell vehicle from Honda, the combustion-powered Hydrogen 7 and Hybrid X6 from BMW, the rotary RE line of cars as well as the RX-8 from Mazda.
Meanwhile, the Japanese giant automaker Toyota is also working on its own hydrogen fuel cell car which could hit the streets as early as 2014.
That is, the streets of California at least. Toyota's initial plan was to have a hydrogen fuel-cell car on the street by 2015, however a full year was struck out of that number to meet the incentives within California's Zero Emission Vehicle (ZEV) directive.
The California ZEV directive is influencing much of what is happening, as they are followed by 14 states at least and they have an impact on about 50 percent of all the cars on the market in the US.
Model years 2015 up to 2017 are covered by Phase IV of the directives, so that Toyota can begin complying in the latter part of 2014.
The ZEV scheme of California has also previously been influential to Toyota and other carmakers, including GM, to introduce zero-emissions vehicles, such as the RAV-4 EV and the talked about EV-1.
However, the financial advantages to the program at present offer Toyota a valid business case to manufacture the hydrogen fuel-cell vehicle.