Got an article from my brother about Hydrogen use for transportation. It says, basically, "not now, maybe 10% by 2050". But the best thing about the article is that it shows comparisons of Hydrogen mobility, generated from various sources (natural gas, coal, renewable sources) and the emissions and energy costs of gasoline and diesel as well. See Figure 4 on Page 6 (out of 8 pages) for the graphic comparison. The last 1 1/2 pages is the bibliography. If you are dialing in, the article may take a few minutes to filter down the wire (it took me less than 2 minutes on my dial up). It is an Adobe Portable Data Format (PDF) file, so you need the Adobe Acrobat Reader (free download) to see it.
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