In America, the use of gasohol is increasing all the time. A lot of ethanol is fermented and distilled from maize grown within the US itself. However as the use of ethanol grows the Americans are also importing ethanol from places like Brazil and the Caribbean. In 2004, the US imported 160 million gallons of ethanol on top of its own production
The main problem is finding enough ethanol. If we Europeans added 5% ethanol to our fuel it was reduce CO2 emissions, but we would need 7.5 billion litres of it a year. Thats more than half the total production level in Brazil.
The methods of ethanol production we use at the moment leave large quantities of unused cellulose from the plant material. To make ethanol production work finically in the long term, we need to find a way to use this cellulose. We might develop biogas generators which can break down the excess cellulose into methane, another useful fuel.
Genetically engineered bacteria or enzymes may be able to break down the cellulose into straw and hay and make it available for yeast to make more ethanol.
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