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Describe how ethanol-based fuels are produced

Why is ethanol described as 'carbon neutral'?

Give an example of a bio gas?

What is used in biogas generators to create biogas?

What happens in bio gas generator?

What are the conditions needed in a biogas generator?

On a large scale where does the waste come from?

What are the uses of gas produced by bio gas generators?

The shorter the food chain...

How are the two ways we can produce meat more effectively?