❓ 質問 According to the passage, what is a primary reason for the undervaluation of ecosystem services in traditional markets?
- A. A) They are difficult to measure due to their spatial and temporal variability.
- B. B) Many are public goods, making them hard to price in conventional economic terms.
- C. C) They are often provided by remote or inaccessible locations.
- D. D) Environmental policies have historically ignored scientific evidence.