❓ 题目 According to the passage, one of the main reasons for the controversy over formally recognizing the Anthropocene is that
- A. A. human activities have had no measurable impact on global ecosystems
- B. B. the proposed stratigraphic markers are not consistent across different parts of the world
- C. C. Paul Crutzen invented the term for purely political purposes
- D. D. scientists unanimously agree on the exact start date of 1952