According to Robert Contanza, what percentage of the total cost of various ecosystem services is used for nutrient recycling and recreation activity?

Options

A. `{:("Nutrient recycling ","Recreation"),("Less than 10%","More than 10%"):}`
B. `{:("Nutrient recycling ","Recreation"),("Less than 10%","Less than 10%"):}`
C. `{:("Nutrient recycling ","Recreation"),("More than 10%","More than 10%"):}`
D. `{:("Nutrient recycling ","Recreation"),("6%","6%"):}`

Answer

To answer the question regarding the percentage of the total cost of various ecosystem services that is attributed to nutrient recycling and recreation activity according to Robert Constanza, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Ecosystem Services**:
- Ecosystem services are the benefits that humans derive from natural ecosystems, including clean air and water, fertile soil, biodiversity, and recreational opportunities.

2. **Identifying Key Services**:
- Among the various ecosystem services, nutrient cycling and recreation are two specific services that are often evaluated for their economic value.

3. **Robert Constanza's Estimation**:
- Robert Constanza and his colleagues estimated the total value of ecosystem services to be approximately 33 trillion US dollars.

4. **Percentage Breakdown**:
- It was noted that nutrient cycling and recreation each contribute less than 10% to the total value of ecosystem services. This means that together, they account for a small fraction of the overall ecosystem service value.

5. **Conclusion**:
- Therefore, the answer to the question is that both nutrient recycling and recreation activity account for less than 10% of the total cost of various ecosystem services.

### Final Answer:
Less than 10% of the total cost of various ecosystem services is used for nutrient recycling and recreation activity.