❓ 题目 According to the passage, which of the following is a primary reason why the formal recognition of the Anthropocene is still debated?
- A. A. There is insufficient evidence of human impact on sedimentary layers.
- B. B. The proposed start dates for the epoch vary widely due to the uneven onset of human activities.
- C. C. The term was only popularized recently and lacks scientific backing.
- D. D. Scientists cannot agree on whether human activity has actually altered the Earth's systems.