Biofuels

Used to decompose living organism's
waste or dead plants to create biogas= fuel

Can be burnt to heat water, central
heating sysytem, power
turbine= generate electricity

Can be used as fuels for car or buses

Ethanol = fuel

Only gives out carbon dioxide and water

Can be produced by using yeasy to ferment sugar.
Sugar cane, sugar beet can be used to in production of ethanol.

Cars can run on 10% ethanol and 90% petrol also
known as gasohol.

Diadvantage is that it needs lots of land to grow
the crop needed which means less land for food crops.

Advantage

Less crude oil is being used

Crops abosorb carbon dioxide from
atmosphere for photosynthesis
which balances co2 thtas released
when gasohol is burnt.

But distilling etanol from fermentation takes lots
of energy so not a good idea or perfect solution.

It's renewable

Plants which decomposes to make
biofuel can be repalced
very quickly with new crops.

Dead plnts when alive photosynthesised
rmoving cardon dioxide= blances carbon dioxide
released when burning biogas

Fairly clean not many particulate produced
or significant amounts of sulfur dioxide

Raw material are cheap and readily available