❓ 質問 According to the passage, what is a primary reason some scientists oppose formalizing the Anthropocene as a geological epoch?
- A. The proposed markers, such as radioactive isotopes and microplastics, are not globally distributed.
- B. Human impacts have been gradual and uneven, making it difficult to identify a clear geological boundary.
- C. The International Commission on Stratigraphy has already rejected the golden spike at Crawford Lake.
- D. The concept is purely political and has no scientific basis in stratigraphic evidence.