Ethanol fuel, made from plants such as cornand sugar cane, has been advocated by some people as an alternative to gasolinein the United States. However, many critics argue that ethanol is not a goodreplacement for gasoline for several reasons.
First, the increased use of ethanol fuelwould not help to solve one of the biggestenvironmental problems caused bygasoline use: global warming. Like gasoline, ethanolreleases carbon dioxide intothe atmosphere when it is burned for fuel, and carbon dioxide is a greenhousegas: it helps trap heat in the atmosphere. Thus, ethanol offers noenvironmental advantage over gasoline.
Second, the production of significantamounts of ethanol would dramatically reduce the amount of plants available foruses other than fuel. For example, much of the corn now grown in the United Statesis used to feed farm animals such as cows and chickens. It isestimated that ifethanol were used to satisfy just 10 percent of the fuel needs in the UnitedStates, more than 60 percent of the corn currently grown in the United Stateswould have to be used to produce ethanol. If most of the corn were used toproduce ethanol, a substantial source of food for animals would disappear.
Third, ethanol fuel will never be able tocompete with gasoline on price. Although the prices of ethanol and gasoline forthe consumer are currentlyabout the same, this is only because of the help inthe form of tax subsidies given to ethanol producers by the United Statesgovernment. These tax subsidies have cost the United States government over $11billion in the past 30 years. If the United States government were to stophelping the producers in this way, the price of ethanol would increase greatly.
- Main point: 乙醇燃料无法替代汽油
- Sub point 1: 燃烧乙醇燃料会排放二氧化碳，造成全球变暖
- Sub point 2: 制造乙醇燃料导致畜牧业缺乏饲料
- Sub point 3: 乙醇价格过高，依赖政府补贴