New Scientist, Oct. 8 - 14, had a great article on cracking natural gas into hydrogen gas and carbon black. Researchers in Spain bubbled natural gas through a column of molten tin at about 1000C. Hydrogen came off the top while carbon black floated to the surface of the tin. Had a reaction efficiency of about 80%. Would be best to use the hydrogen in a hybrid vehicle - batteries would be charged by a combined cycle "engine". This engine would be a solid oxide fuel cell followed by a supercritical CO2 turbine. Could get power efficiencies in the range of 70%. This would give excellent fuel mileage from a cheap fuel. Disposing of the carbon black would be a problem, but this a minor irritant compared to emitting carbon dioxide. The exhaust from the engine would be water vapor only. A crash program probably could get us converted to this tech in 10 to 15 years. Then, the fear of climate change would become just a memory. But, considering how disfunctional our governmental institutions are, transitioning to this clean technology has a snowball's chance in hell of happening. We're doomed.