雅思听力

🎧 Listening Transcript

Today, in our marine biology lecture, we'll discuss the impact of ocean acidification on coral reefs. As carbon dioxide levels rise, the ocean absorbs more CO2, leading to a decrease in pH. This process, called ocean acidification, severely affects coral growth. A recent study by the University of Queensland found that coral calcification rates have dropped by 15% since 1990. Interestingly, some coral species, like the massive Porites, show greater resilience than branching corals. However, the overall biodiversity in affected reefs is declining, with fish populations decreasing by up to 30% in high-acidification areas. Researchers emphasize the need for global action to reduce emissions.