The latest Honda Clarity Fuel Cell vehicle is the second generation, the original was called the Clarity FCX, way back in 2002. This new model can fill up with hydrogen in under 5-minutes and deliver over 50km of range. The hydrogen is turned into electricity using a fuel cell, then the power is stored in a small battery before the electricity powers the wheels. The only byproduct of the whole process is water vapor from the tailpipe.
There is currently a fuel cell leasing program in the United States for under $400 per month including fuel. In Canada there are no current plans to bring this 5-passenger hydrogen fuel cell vehicle to market. One reason is the lack of filling stations, there is currently only one public hydrogen station in Canada.