TOEFL統合ライティング

📖 読解文章

The construction of large-scale wind farms has been widely championed as a key solution to reducing greenhouse gas emissions. However, a closer examination reveals several significant drawbacks that challenge their viability as a primary energy source. First, wind farms pose a serious threat to bird and bat populations. Studies have shown that turbine blades cause hundreds of thousands of bird deaths annually, including migratory species and raptors, disrupting ecosystems and biodiversity. Second, wind energy is inherently unreliable due to its dependence on weather conditions. Wind speeds fluctuate greatly, leading to intermittent power generation. This variability requires backup from fossil fuel plants, which undermines the goal of reducing carbon emissions and increases operational costs. Third, the construction and maintenance of wind turbines have a substantial environmental footprint. The production of turbine components, particularly the massive blades and towers, requires large amounts of steel, concrete, and rare earth metals, all of which involve energy-intensive mining and manufacturing processes. Moreover, turbine blades have a limited lifespan (about 20 years) and are difficult to recycle, often ending up in landfills. These factors collectively suggest that wind farms are not as environmentally friendly as often claimed.

🎧 リスニング講義

The lecture challenges the reading's claims, arguing that modern technology and careful planning can overcome the alleged drawbacks. First, while bird deaths are a concern, the lecture points out that properly sited wind farms—away from major migration routes and using radar detection systems—can reduce avian mortality by up to 90%. Moreover, the number of bird deaths from wind turbines is minuscule compared to those caused by buildings, cars, and domestic cats. Second, the issue of intermittency is being addressed by advanced energy storage solutions such as grid-scale batteries and pumped hydro storage. These technologies can store excess wind power during peak production and release it when wind is low, ensuring a steady supply. Additionally, wind patterns are now predictable days in advance, allowing grid operators to integrate wind power more effectively. Third, the environmental footprint of turbine production is rapidly diminishing. New blade designs are lighter and use recyclable thermoplastics, and the industry is developing methods to fully recycle old blades. Moreover, the energy payback time for a wind turbine is now less than six months, meaning it offsets all the carbon emitted during manufacturing within half a year of operation. Given these advancements, the lecture concludes that wind farms are a sustainable and reliable energy solution.