❓ 题目 According to the passage, why is the formal recognition of the Anthropocene epoch challenging?
- A. A. Because human impacts are too uniform to provide a clear geological marker.
- B. B. Because scientists disagree on the existence of nuclear fallout in sediments.
- C. C. Because the proposed marker may not be globally synchronous or precise.
- D. D. Because the term has no relevance to policy decisions on climate change.