Narrator: Listen to part of a lecture in an environmental science class. Professor: Today we're going to talk about a surprising hero in the fight against climate change: the humble oyster. While we often focus on reducing carbon emissions, we overlook natural carbon sinks. Oysters, along with other shellfish, play a crucial role in carbon sequestration. When oysters grow, they absorb carbon dioxide from the water to build their shells, which are made of calcium carbonate. This process locks the carbon away for centuries, even after the oyster dies, as the shells accumulate on the ocean floor. Additionally, oyster reefs provide habitats for other marine life, enhancing biodiversity and helping coastal ecosystems thrive. However, overharvesting and pollution have decimated oyster populations worldwide, reducing their capacity to capture carbon. Restoration projects, like those in New York Harbor, are working to rebuild these reefs. The professor's point is that protecting and restoring oyster populations could be a win-win for both the environment and coastal economies.
❓ 题目 What is the main purpose of the lecture?
A. To explain how oysters build their shells
B. To discuss the role of oysters in carbon sequestration and ecosystem health
C. To describe the history of oyster harvesting in New York
D. To argue for reducing carbon emissions
✅ 正确答案
To discuss the role of oysters in carbon sequestration and ecosystem health