Students in the lab working, on a small sample of bio-diesel; process is called transesterification

This year, the priceof oil has soared, in recent weeks reaching a new high of $135 a barrel. Thishas sparked protests in many countries, including Britain, where truck driversrecently blocked roads in several cities to protest the price of fuel.   

 For some, the high cost of fuel has promptedmore creativity. A growing number ofmotorists are making their own bio-diesel with recycled cooking oil. It's only cheaper, but greener too.  

Catherine Drew visited a course nearOxford, England to see how it is done.