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In page Ethanol fuel:

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Ethanol is considered a renewable energy source, but its production raises environmental and economic concerns. While sugarcane-based ethanol in Brazil offers a favorable energy balance and lower carbon emissions compared to gasoline, corn-based ethanol in the United States provides more modest benefits. Large-scale cultivation for ethanol can affect food prices, water resources, and land use, and emissions from production and combustion vary by feedstock and process. Research continues into cellulosic ethanol and other advanced methods to improve sustainability and reduce environmental impact.[citation needed]