The consequences of global warming may be……
increase in average temperature of the earth
melting of Himalayan Glaciers
increased biochemical oxygen demand.
select the correct option.

Options

A. I and III
B. Only I
C. I and II
D. Only III

Answer

To solve the question regarding the consequences of global warming, we need to evaluate the three statements provided and determine their validity based on our understanding of global warming.

### Step-by-Step Solution:

1. **Understanding Global Warming**:
- Global warming refers to the increase in the Earth's average surface temperature due to rising levels of greenhouse gases, such as CO2, CH4, and NO2. These gases trap solar radiation, preventing it from escaping back into space.

2. **Analyzing Statement 1**:
- The first statement claims that there will be an increase in the average temperature of the Earth.
- **Conclusion**: This statement is correct. Global warming leads to an increase in the Earth's average temperature.

3. **Analyzing Statement 2**:
- The second statement suggests that there will be a melting of the Himalayan glaciers.
- **Conclusion**: This statement is also correct. As global temperatures rise, glaciers, including those in the Himalayas, are expected to melt.

4. **Analyzing Statement 3**:
- The third statement states that there will be an increase in biochemical oxygen demand (BOD).
- **Conclusion**: This statement is incorrect. While global warming can impact ecosystems, an increase in BOD is not a direct consequence of global warming. BOD relates more to organic pollution in water bodies rather than temperature increases.

5. **Selecting the Correct Option**:
- Now, we summarize our findings:
- Statement 1: Correct
- Statement 2: Correct
- Statement 3: Incorrect
- The options provided are:
- Option 1: 1 and 3 (Incorrect)
- Option 2: Only 1 (Incorrect)
- Option 3: 1 and 2 (Correct)
- Option 4: Only 3 (Incorrect)
- Therefore, the correct answer is **Option 3: 1 and 2**.

### Final Answer:
The correct option is **3 (1 and 2)**.

---