Liquid coal for cars 'dirtier' than petrol

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Some alternative vehicle fuels such as liquid coal can cause more harmful greenhouse gas emissions than petrol or diesel, scientists warn. Liquid coal, or example, can produce 80% more global warming pollution than [petrol].Likewise another alternative fuel, petrol from tar sands, is estimated to have 14% more global warming potential compared with standard petrol. The cleanest alternative, the report says, is cellulosic ethanol, made from grass or wood chips. It could cut greenhouse emissions compared with petrol by more than 85%. Source: http://www.abc.net.au/science/news/stories/2007/2090413.htm?enviro