The construction of large-scale solar power plants in desert regions is often hailed as a key solution to global energy demands. However, this approach has significant drawbacks that make it less viable than commonly assumed. First, desert solar farms require enormous amounts of water for cleaning and cooling the solar panels. In arid environments, water is scarce, and diverting it from local ecosystems and communities could lead to severe shortages. For example, the Ivanpah Solar facility in California has been criticized for using millions of gallons of water annually. Second, the remote location of deserts necessitates long-distance transmission lines, which are costly to build and maintain. Energy losses during transmission over hundreds of kilometers can be as high as 10-15%, reducing overall efficiency and increasing costs. Third, desert solar farms disrupt fragile desert ecosystems. Construction and maintenance activities destroy habitats of endemic species, such as the desert tortoise, and the large land areas required can fragment wildlife corridors. These ecological impacts are often irreversible, undermining the very environmental benefits solar energy is supposed to provide. Therefore, despite the abundant sunlight, desert solar power plants present serious practical and environmental challenges.
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The reading raises concerns about desert solar farms, but these objections are not as strong as they appear. First, while water use is a concern, modern solar technologies, such as photovoltaic panels with dry-cooling systems, require minimal water. In fact, many new desert plants use air-cooling and robotic cleaning methods that reduce water consumption by up to 90%. Moreover, the water used can be treated or sourced from brackish aquifers that are not suitable for drinking, so the impact on local water supplies is minimal. Second, the issue of transmission losses is being addressed by advances in high-voltage direct current (HVDC) technology, which can transmit electricity over long distances with losses of only 3-5% per 1,000 kilometers. Additionally, the cost of HVDC lines has dropped significantly, and economies of scale make the overall investment worthwhile, especially when compared to the costs of fossil fuel power plants. Third, the ecological disruption can be mitigated through careful site selection and design. For instance, solar arrays can be elevated to allow wildlife movement underneath, and fencing can be designed to avoid fragmentation. Furthermore, many desert areas are already degraded or barren, and solar farms can actually provide shaded microhabitats that benefit some species. In sum, the perceived drawbacks can be overcome with current technologies and planning strategies.
📝 작문 지시 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).
