The consequences of global warming may be

Options

A. increase in average temperature of the earth
B. melting of Himalayan Glaciers
C. increased biochemical oxygen demand
D. Eutrophication

Explanation

### Step-by-Step Solution:

1. **Understanding Global Warming**:
- Global warming refers to the long-term increase in Earth's average surface temperature due to human activities, primarily the emission of greenhouse gases such as carbon dioxide (CO2), methane, and ozone.

2. **Analyzing the Options**:
- We are given four options to evaluate their consequences related to global warming.

3. **Option A - Increase in Average Temperature of the Earth**:
- This option is correct. The increase in greenhouse gases leads to more heat being trapped in the atmosphere, resulting in a rise in the Earth's average temperature.

4. **Option B - Melting of Himalayan Glaciers**:
- This option is also correct. As global temperatures rise, glaciers and ice caps, including those in the Himalayas, are melting due to increased heat from global warming.

5. **Option C - Increase in BOD (Biochemical Oxygen Demand)**:
- This option is incorrect. BOD measures the amount of organic matter in water and is not directly related to global warming. It is more associated with water pollution rather than temperature changes.

6. **Option D - Eutrophication**:
- This option is also incorrect. Eutrophication is a process that results from nutrient pollution in water bodies, leading to excessive growth of algae. It is not a direct consequence of global warming.

7. **Conclusion**:
- The correct consequences of global warming from the options provided are:
- Option A: Increase in average temperature of the Earth (Correct)
- Option B: Melting of Himalayan glaciers (Correct)
- Option C: Increase in BOD (Incorrect)
- Option D: Eutrophication (Incorrect)

### Final Answer:
The consequences of global warming may be:
- A. Increase in average temperature of the Earth (Correct)
- B. Melting of Himalayan glaciers (Correct)
- C. Increase in BOD (Incorrect)
- D. Eutrophication (Incorrect)