❓ 質問 According to the passage, which of the following is a primary reason critics oppose formally recognizing the Anthropocene as a geological epoch?
- A. A. The proposed markers, such as microplastics, are not persistent enough in the rock record.
- B. B. Human impacts have not yet caused significant changes to the Earth's climate and biodiversity.
- C. C. It is difficult to identify a single, globally synchronous starting point for human influence.
- D. D. The term 'Anthropocene' has been rejected by most environmental scientists.