Can you tell about hydrogen as a fuel?

How is hydrogen used as a fuel? How is it produced? What are the advantages and disadvantages?

Answers
The key advantages are that it is an alternative to normal fuels which emit a large amount of CO2, hydrogen only emits water vapor when burned
chloe
20 April 2011
The disadvantages include the fact that it is expensive to produce, cannot be easily stored and takes a great deal of energy to produce (thus undermining the advantages gained by not producing CO2 when burned)
chloe
20 April 2011
Hydrogen doesn't exist as a gas on earth (another disadvantage) so it has to be made by separating it from other atoms. The most common method is to use water electrolysis to split hydrogen from water.
chloe
20 April 2011
The fact that we use up water in order to make hydrogen is another disadvantage as there is an increasing shortage of water on earth which should be used sparingly in order to grow enough food to feed us all!
chloe
20 April 2011
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