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some alternate fuels have already been developed , and there are others in the pipeline . Many of them are ...... fuels so unlike fossil fuels they won't .... ..... . However none of them are perfect - they all have pros and cons . Alternate fuels include ...... , ...... , ......
- run out
biodiesel come from
the products of living organisms, such as methane biogas from decaying manure and sewage. Vegetable oils are also used as fuels for vehicles. Some of this biodiesel is made from waste cooking oil and rapeseed oil
biodiesel is ...... .... because the CO2 released when its burnt was .... .... .... .... ..... .... .... ....
- carbon neutral
- taken in by the plant as it grew .
with biodiesel engines
dont need gto be converted
biodiesel produces a lot
less sulphur dioxide and particulates than ordinary diesel or petrol
biodiesel can be mixed with
ordinary diesel fuel and used to run a diesel engine
the problem with biodiesel is we cant make
enough to completely replace diesel it is expensive to make
using biodiesel rather than fuels from crude oil reduces our
biodiesel is ...... than diesel by nearly ..... a litre
the problem with biodiesel is that poorly produced biodiesel may become
conatminated with water which can damage fuel pumps and engines
although waste oil can be used to produce biodiesel which is perhaps cheaper for an individual rather than buying diesel . you do have to buy
a fuel pod to convert waste oil to biodiesel and his costs just over £3000
producing biodiesel means burning forests to make way for crops . This means that
- habitats will be destroyed
- trees are also carbon sinks however when they are destroyed they no longer take in CO2
producing biodiesel means that agricultural
land is destroyed this may mean that there will be food shortages in the future and this will lead to an increase in food prices
overall the problem with using ethanol as a fuel is
- ethanol fuel isnt widely available
- engines need to be converted before they'll work with ethanol fuels
hydrogen gas can also be used to power vechiles . You get hydrogen from the
electrolysis of water - there's plenty of water about but it takes electrical energy to split it up . This energy can come from a renweable source such as solar or wind power
the pros of using hydrogen gas as a fuel are
hydrogen combines with oxygen in the air to form just water - so it's a very clean fuel
when hydrogen burns the only waste product produced is
water vapour , which does not cause the pollution problems of other fuels
hydrogen fuel cells are the most promising way to use hydrogen as a fuel for cars . These
generate electricity by reacting hydrogen with oxygen from the air . The electricty can then power electric motors
hydrogen is ....... , so it must be transported and handled with care .
Hydrogen is bulky and difficult to store as
a gas , so it is usually stored as a liquid at high pressure and low temperature
you need a special , expensive ....... and hydrogen isnt ...... ......
What would you like to do?
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