The ' greenhouse effect ' results in

Options

A. the warming of climate
B. blocking Earth's heat from escaping into space
C. increases the temperature of Earth, which sustains life
D. all of the above

Answer

To solve the question regarding the effects of the greenhouse effect, we will analyze each option provided in the question step by step.

### Step-by-Step Solution:

1. **Understanding the Greenhouse Effect**:
- The greenhouse effect is a natural process where certain gases in the Earth's atmosphere trap heat. This process is essential for maintaining the Earth's temperature and sustaining life.

2. **Analyzing Option A**:
- **The warming of climate**: The greenhouse effect leads to an increase in the Earth's average temperature, which contributes to climate change. Thus, this option is correct.

3. **Analyzing Option B**:
- **Blocking earth heat from escaping into space**: Greenhouse gases such as CO2, CH4, and N2O absorb infrared radiation emitted from the Earth's surface and re-radiate it back towards the Earth. This prevents some of the heat from escaping into space, making this option correct as well.

4. **Analyzing Option C**:
- **Increases the temperature of earth which sustains life**: The greenhouse effect keeps the Earth warm enough to support life. Without it, the Earth would be too cold for most life forms to survive. Therefore, this option is also correct.

5. **Conclusion**:
- Since all three options (A, B, and C) are correct, the answer to the question is **D. All of the above**.

### Final Answer:
**D. All of the above**

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