The price tag given to fundamental ecosystem services is approximately

Answer

To answer the question about the price tag given to fundamental ecosystem services, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Ecosystem Services**:
- Ecosystem services are the benefits that humans receive from the natural environment. These include provisioning services (like food, water, timber), regulating services (like climate regulation, flood control), cultural services (like recreational and spiritual benefits), and supporting services (like nutrient cycling and soil formation).

2. **Identifying Key Contributions**:
- Fundamental ecosystem services encompass a wide range of products and benefits that ecosystems provide, such as fruits, vegetables, wood, and fossil fuels.

3. **Researching Economic Valuation**:
- Ecological economists attempt to assign a monetary value to these services to highlight their importance and encourage conservation efforts.

4. **Referencing Dr. Robert Costanza's Work**:
- Dr. Robert Costanza, a prominent ecological economist, conducted a study to estimate the economic value of global ecosystem services.

5. **Citing the Estimated Value**:
- According to Dr. Costanza's research, the estimated price tag for fundamental ecosystem services is approximately **US dollars 33 trillion**.

### Final Answer:
The price tag given to fundamental ecosystem services is approximately **US dollars 33 trillion**.

---