End of the Road for Hydrogen
Hydrogen cars sound ideal, but there are practical problems. First, the hydrogen tank takes eight minutes to fill and it takes up most of the boot space. Even then, the hydrogen tank provides a range of only 125 miles. To get enough hydrogen into the fuel tank it has to be chilled and liquefied. Gradually it warms up and boils away, so if you don't use the car over the weekend you'll find less in the tank. Park up at the airport while you take your three-week holiday and when you get back it'll be nearly empty.
The fact that the hydrogen has to boil off for safety reasons may be why hydrogen vehicles are illegal in France. Even over here you are advised not to park the vehicle in an enclosed car park. You cannot see hydrogen, you cannot smell it and it burns with an invisible flame. Like petrol vapour, when mixed with air it is highly explosive. At least you can smell petrol!
Where does hydrogen come from? It is either extracted from natural gas or electrolysed by passing a current through water. Extracting hydrogen from natural gas leaves carbon dioxide, which must be captured - otherwise the process produces as much CO2 emissions as if you had just burnt the gas. Electrolysis produces no CO2, but it does produce a lot of waste heat so the energy content of the hydrogen is significantly less than the energy of the electricity used. Electricity itself comes from coal, gas or nuclear, and the electricity produced is also much less than the fuel put into the generation process. Producing hydrogen this way is very inefficient.
All these factors make it very doubtful that hydrogen will be the fuel of the future. As we approach Peak Oil and petrol becomes more and more expensive, economies and cutting back on our travel will be the only solution.
How will you change your lifestyle when petrol costs £5/litre? (That's $36.95 per US gallon.)
Related Tags: energy, change, hydrogen, climate, fossil, global, warming, crisis, fuels
About the author: Anthony Day is a speaker, writer and management accountant. He is not a member of Greenpeace, the Greens, Friends of the Earth or any campaigning group. His views are his own. As an accountant he is concerned with the practical effects of climate change and energy on business, society and our fundamental economic survival. His new book Will climate change your life? How to Drive a 4x4 and Still Save the Planet, is due for publication in February 2007. Visit http://www.anthony-day.co.uk to sign up to his newsletter and receive Anthony's Europe's Energy Conundrum - The Next 10 Years special report absolutely free.
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