Suitable for current distribution systems
If we decide to make all vehicles run on biofuel, it wouldn't take too much effort or money. We already have refueling stations around the world, which deliver liquid fuel into tanks in cars.
While the cars themselves would need minor modification, the whole thing would be relatively painless to implement.
Lower carbon emissions
In comparison with fossil fuels, biofuels do emit far less carbon. This is mainly because ethanol is the primary biofuel. Ethanol has 2 carbon atoms, while oil contains much longer chain molecules.
Developed
The technology required for the widespread implementation of biofuels is already available. Unlike many other renewable technologies, say solar power, there is no real need for much research and development.
High energy density
Like fossil fuels, a relatively small amount of fuel can produce a reasonable amount of energy, unlike other alternative energy sources like solar and wind energy which are diffuse.
This makes biofuel more suited to applications in transport, where a vehicle needs to carry its fuel onboard to travel long distances.
Cost
In the current economic climate, biofuels can be cheaper than the equivalent amount of oil. There are even financial incentives for farmers to grow biofuel crops.
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