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 significant environmental and economic benefits. First, biofuels are considered carbon-neutral because the carbon dioxide emitted during combustion is roughly equivalent to the amount absorbed by the plants during their growth. This cycle supposedly helps mitigate climate change by not adding net CO2 to the atmosphere. Second, biofuels reduce dependence on imported oil, enhancing national energy security. By producing fuel domestically from agricultural crops, countries can lessen their vulnerability to volatile global oil markets and geopolitical tensions. Third, the biofuel industry stimulates rural economies by creating new markets for farmers and generating jobs in processing and distribution. This economic boost can revitalize declining agricultural communities and support rural infrastructure. However, these claims rest on assumptions that overlook critical drawbacks. The production of biofuels requires large amounts of land, water, and fertilizer, which can lead to deforestation, water scarcity, and soil degradation. Moreover, the competition between food and fuel crops can drive up food prices, affecting vulnerable populations. Despite these concerns, many policymakers and industry leaders continue to advocate for increased biofuel production as a key component of a greener energy portfolio.
🎧 听力讲座
🎯 模拟考试环境：先点「播放讲座」听完内容，再作答。听力原文默认隐藏。
Now listen to a lecture on the same topic from an environmental scientist. The professor challenges the reading's optimistic view of biofuels. First, the claim of carbon neutrality is misleading. While plants absorb CO2 during growth, the cultivation, harvesting, and processing of biofuel crops require fossil fuels for tractors, fertilizers, and transport. When these emissions are factored in, the net greenhouse gas reduction is much smaller than claimed—and in some cases, biofuels may emit more CO2 than conventional gasoline. Second, energy security is not necessarily enhanced. Many biofuel programs rely on imported feedstocks or foreign technology, and diverting domestic agricultural land to fuel production can reduce food exports, creating trade imbalances. Moreover, biofuel production is often tied to global commodity prices, so countries remain exposed to market fluctuations. Third, the rural economic benefits are overstated. The biofuel industry tends to favor large agribusinesses over small farmers, leading to land consolidation and the displacement of local communities. Additionally, government subsidies for biofuels often divert funds from other agricultural sectors, and the promised job creation is frequently lower than projected due to mechanization. In sum, the purported advantages of biofuels are largely illusory when examined closely.
📝 คำแนะนำการเขียน Summarize the points made in the lecture, being sure to explain how they cast doubt on the specific points made in the reading passage.
📊 TOEFL Integrated Writing Rubric
Content Accuracy: Accurately capture the relationship between lecture and reading
Information Completeness: Cover all key counter-arguments from the lecture
Structure & Coherence: Logical organization and progression
Language Use: Grammar, vocabulary, expression accuracy
Scored 0-30 based on holistic scoring (original 0-5, scaled to 30).
