I'll just make a general comment on that. It is possible, technically, to produce hydrogen via electrolysis, whereby the electricity is generated from a zero-emission source. It's really an economic question more than a technical question at this point. There's a loss of efficiency as well in going from converting twice to electricity and then to hydrogen. The technology does exist, but the economics do not favour producing hydrogen from a renewable resource at this point.
On October 24th, 2006. See this statement in context.