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Producing biofuels from a fast-growing grass [7]delivers vast savings of carbon dioxide emissions compared with petrol, a large-scale study has suggested. US researchers also found that switchgrass-derived ethanol produced 540% more energy than was required to manufacture the fuel.
One acre (0.4 hectares) of the grassland could, on average, deliver 320 barrels of bioethanol, they added.
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[7] http://news.bbc.co.uk/2/hi/science/nature/7175397.stm
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