Brazil's sugarcane ethanol performs much better than ethanol made from maize in that respect: Shell claims it produces 70% less carbon dioxide than petrol, mile for mile.

在减少排放温室气体方面，巴西的甘蔗造乙醇表现比玉米造乙醇好得多：壳牌声称，汽车每英里所耗燃料，甘蔗造乙醇比汽油产生的二氧化碳少70%。

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Fermentation produces carbon dioxide, and so reduces the amount of carbon available to be converted to ethanol.

发酵产生二氧化碳，从而减少了本可以转化为乙醇的碳。

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Although the glass shape did not affect the concentration of ethanol vapor, the temperature did, with chilled champagne releasing less ethanol, but the same amount of carbon dioxide.

虽然酒杯的形状并不影响乙醇蒸气的浓度，但对于释放少量乙醇的冰镇香槟而言，酒杯形状却能对相同数量的二氧化碳产生影响。

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The bioreactors will grow algae that can produce ethanol fuel through a special process that involves using carbon dioxide from nearby coal-burning power plants to promote faster growth of the algae.

VOA: standard.2009.09.02

Even Al Gore now admits that corn-based ethanol produces more carbon dioxide than it saves.

FORBES: Global Warming And Global Food Security

Any defense of U.S. ethanol policy must embrace a series of fallacies which include: that ethanol produced from corn makes the U.S. less dependent on fossil fuels, that ethanol lowers the price of gasoline, that an increase in the percentage of ethanol blended into gasoline boosts the overall supply of gasoline, and that ethanol is environmentally friendly and lowers global carbon dioxide emissions.

FORBES: Feds Could Lessen Drought Impacts But Don't Bet The Farm On It

Last week, the Obama Administration said its new calculations showed that grain-based biofuels like corn ethanol and soy-based biodiesel displaced more carbon dioxide than originally thought.

FORBES: U.S., Europe Going Opposite Way On Biofuels