Viết tích hợp TOEFL

📖 Đoạn văn

The use of biofuels, such as ethanol derived from corn, has been widely promoted as a sustainable alternative to fossil fuels. Proponents argue that biofuels offer three key environmental and economic benefits. First, they reduce greenhouse gas emissions because the carbon dioxide released when they are burned is roughly equivalent to the carbon dioxide absorbed by the crops during their growth, creating a carbon-neutral cycle. Second, biofuels decrease dependence on imported oil, enhancing national energy security by relying on domestically produced agricultural products. Third, the biofuel industry stimulates rural economies by creating jobs in farming, processing, and distribution, thereby supporting agricultural communities. These advantages have led many governments to mandate blending biofuels with gasoline, expecting a significant shift toward cleaner energy.

🎧 Bài giảng

While the reading presents biofuels in a favorable light, the reality is far more complex, and each claimed benefit is questionable. First, the carbon-neutrality argument ignores the full lifecycle emissions. Producing biofuels requires significant energy for planting, harvesting, fertilizing, and refining—often derived from fossil fuels. When these inputs are considered, the net reduction in greenhouse gases is minimal, and in some cases, biofuels may emit more than conventional gasoline. Second, the claim of energy security is misleading. Many biofuel crops, like corn, require large amounts of water and arable land, which are not universally available. In countries that rely on imported oil, they may also import biofuel feedstocks, shifting dependence rather than eliminating it. Third, the economic benefits to rural areas are overstated. Government subsidies and mandates often drive biofuel production, but this can inflate food prices, hurting farmers who are also consumers. Moreover, the industry tends to consolidate large agribusinesses, not small family farms, so the promised job creation is often minimal. Thus, the reading's optimistic view fails to withstand scrutiny.