❓ 题目 According to the passage, what is a major reason why some scientists oppose formally recognizing the Anthropocene as a geological epoch?
- A. A. Human impact on Earth systems is not yet significant enough to be measured.
- B. B. The markers of human influence, such as nuclear isotopes, are not found in any geological strata.
- C. C. Human effects on the environment occurred at different times globally, lacking the synchrony needed for a formal boundary.
- D. D. The term Anthropocene was coined by a chemist rather than a geologist.