Call your doctor at once if you have any of these serious side effects: 1  severe headache; 2  bloody urine, painful urination; 3  fever, chills, body aches, flu symptoms; 4  chest pain; 5  feeling short of breath, even with mild exertion; or.  swelling of your ankles or feet.
Biofuel is a product produced from biomass. As the biofuel definition above suggests, this fuel is considered much cleaner than petrol/diesel alternatives. Biofuel is considered carbon neutral, as the biomass absorbs roughly the same amount of carbon dioxide during growth, as when burnt.
By biofuels on this page, I mean fuels for vehicles, such as biodiesel and bioethanol - although you can also use the term biofuel to cover any kind of fuel made from living materials or their waste. Biogas is another biofuel which can be used to power vehicles, and is covered on another page. How it works.