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Originally Posted by Graham
The problem is that it takes energy to split hydrogen from oxygen and, until we get fusion working, you need to put more energy in than you get out.
That doesn't mean that it's not feasible, it would be better to produce any output of greenhouse gasses etc in one location (ie a power station) where they can be dealt with on a "bulk" basis, rather than on an "individual" (ie car by car) basis, but it will take time and money and at the moment there are too many vested interests (especially at the heart of the US Government!) for much to change.
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That's how I understand it too. But I think the process is a lot more advanced than we realise, and nearer to fruition. Apparently there is a already a hydrogen filling station at one of the German airports? Also, a lot of the big car manufacturers are piling money into R&D; this link shows a ew of them:
http://www.hydrogenhighway.com/hhcars.htm
As for the US, it seems that President Bush has earmarked a big chunk of public money to fund R&D as well; I believe the figure is $1.7bn.
All very interesting.
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In addition to my earlier comments, it looks like hydrogen fuel cells are already being tested by TFL on some Londom buses. So the technology is here, it just needs refining?
http://www.tfl.gov.uk/buses/fuel-cell-buses.asp