One of the most promising sources of renewable energy for powering vehicles is biofuel technology, where vegetable oil is used instead of petrol or diesel.
Biofuels contain no sulphur and are almost carbon neutral although their emissions of nitrogen oxides are similar to conventional fuels.
There are two main methods of using biofuel technology in cars: vegetable oil can be processed into biodiesel for use in standard diesel engines or engines can be modified to...
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