This process was developed and successfully utilized by the Germans in WWII. I have not found what the environmental downside is -- but I suspect it has its share. http://www.ultracleanfuels.com/html/mr.htm If this actually becomes viable due to the rising cost of crude oil, what would the impact of this process be on the United States? *EDIT* I should have posted this in Environmental Discussion - sorry. Could it be moved please?