❓ Câu hỏi According to the passage, why is the economic valuation of ecosystem services problematic?
- A. Because most ecosystem services are too complex to be quantified in monetary terms.
- B. Because many of these services are public goods and lack market prices, making valuation difficult.
- C. Because ecologists oppose the idea of assigning monetary worth to nature.
- D. Because the Millennium Ecosystem Assessment has already provided a complete valuation.