TOEFL 통합 작문

📖 읽기 지문

The widespread adoption of electric vehicles (EVs) has been proposed as a key solution to reduce greenhouse gas emissions and dependence on fossil fuels. However, several significant challenges undermine the feasibility of a rapid transition to EVs. First, the production of EV batteries requires rare earth metals such as lithium, cobalt, and nickel, whose extraction is environmentally destructive and often involves unethical labor practices. Mining these materials leads to habitat destruction, water pollution, and high carbon emissions, offsetting the environmental benefits of EVs during their operational life. Second, the current electrical grid in many countries is not equipped to handle the increased demand from mass EV charging. Upgrading the grid to support millions of EVs would require enormous investments and time, potentially causing frequent blackouts and instability in the short term. Third, the limited driving range of EVs and the insufficient charging infrastructure create practical barriers for consumers, especially in rural or less developed areas. Range anxiety, or the fear of running out of battery before reaching a charging station, discourages many potential buyers, and building a comprehensive charging network is both costly and logistically challenging. These factors collectively suggest that EVs may not be a viable near-term solution for sustainable transportation.

🎧 듣기 강의

The professor challenges the reading's claims by presenting counterarguments for each point. First, while it is true that battery production involves mining, the professor points out that technological advancements are rapidly reducing the environmental impact. For instance, new methods of recycling lithium and cobalt, as well as the development of solid-state batteries that require fewer rare materials, are already being implemented. Moreover, the total lifetime emissions of an EV, including production, are still lower than those of a conventional gasoline car, as studies have shown. Second, the concern about grid capacity is overstated. The professor argues that smart charging technology, which allows EVs to charge during off-peak hours, can manage demand without massive grid upgrades. Additionally, many EVs can discharge stored energy back to the grid, acting as mobile batteries that actually stabilize the grid during peak times. Third, the issue of range and infrastructure is being rapidly addressed. The average driving range of new EVs has exceeded 300 miles, and the number of fast-charging stations is growing exponentially. Furthermore, government incentives and private investments are helping to build charging networks in underserved areas, and the emergence of wireless charging and battery-swapping technologies may soon eliminate range anxiety altogether. Therefore, the professor concludes that the obstacles mentioned in the reading are temporary and solvable, not fundamental flaws.