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IELTS Free Online Writing Practice - Is ocean acidification reversible?

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IELTS Writing Task 2 Topic: "Is ocean acidification reversible?"

Model Answer:

In recent years, there has been increasing concern about the phenomenon of ocean acidification due to the absorption of carbon dioxide (CO2) from the atmosphere. Some argue that this process is irreversible, while others contend that it can be mitigated with appropriate measures. This essay will discuss both perspectives and provide an evaluation based on scientific evidence and the feasibility of potential solutions.

Firstly, it's essential to understand the causes and consequences of ocean acidification. The primary driver of this process is the increasing levels of CO2 in the atmosphere, primarily due to human activities such as burning fossil fuels. As the CO2 dissolves in seawater, it forms carbonic acid, leading to a more acidic environment in the oceans. This change in pH level can have various detrimental effects on marine life, particularly on organisms with calcium carbonate shells or skeletons, such as mollusks, corals, and some plankton species. Moreover, it may also impact the ability of marine creatures to detect and respond to chemical cues in their surroundings, which can affect their behavior, reproduction, and survival.

Some scientists claim that ocean acidification is an irreversible process due to the long time scales involved in geological processes. The ocean's buffering capacity, which helps regulate pH levels, is not infinite, and once a certain threshold is crossed, it becomes increasingly difficult to restore the original conditions. Additionally, some researchers argue that even if CO2 emissions were to cease immediately, the ocean's ability to absorb and neutralize excess CO2 would be insufficient to reverse the trend of acidification.

However, others believe that ocean acidification can be mitigated with appropriate measures. One proposed solution is the large-scale implementation of carbon capture and storage (CCS) technologies, which involve capturing CO2 emissions from power plants and other sources, transporting them, and storing them underground or in other geological formations. If CCS were to become a widely adopted practice, it could potentially reduce the rate at which ocean acidification occurs. Another potential strategy is the enhancement of natural carbon sinks, such as mangroves, seagrass beds, and kelp forests, through reforestation and restoration efforts. These ecosystems can absorb significant amounts of CO2, thereby helping to alleviate ocean acidification.

In conclusion, while there are strong arguments suggesting that ocean acidification may be irreversible due to the long time scales involved in geological processes, there is also evidence to support the notion that it could be mitigated through strategic interventions such as carbon capture and storage, and the enhancement of natural carbon sinks. The feasibility and effectiveness of these potential solutions will depend on global cooperation and a commitment to reducing greenhouse gas emissions.

Score: Based on IELTS scoring standards, this response would likely receive a Band 8 or higher due to its clear structure, relevant content, and appropriate use of evidence to support the argument. The writing demonstrates a strong understanding of the topic and is well-organized, with effective use of paragraphs and coherence throughout.

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