❓ 题目 According to the passage, which of the following is a primary reason why the Anthropocene has not been formally recognized as a geological epoch?
- A. A. The term was only popularized recently by Paul Crutzen, and thus lacks historical precedent.
- B. B. Human impacts on Earth systems are not globally synchronous, making it difficult to identify a single stratigraphic marker.
- C. C. The concept has been too heavily influenced by public discourse and interdisciplinary research to be scientifically valid.
- D. D. There is insufficient evidence of human-induced changes such as radioactive isotopes and plastic pollution in the geological record.