Which of the following are the correct approaches to reduce global warming ?
(i) Use of fossil fuels
Improving efficiency of energy usage
(iii)Afforestation
(iv) Increasin growth of human population

Options

A. (i) and (ii)
B. (ii) and (iii)
C. (iii) and (iv)
D. (i), (ii) and (iii)

Explanation

To determine the correct approaches to reduce global warming from the given options, we will evaluate each option one by one.

### Step-by-Step Solution:

1. **Evaluate Option (i): Use of fossil fuels**
- The use of fossil fuels contributes to global warming because it increases carbon emissions. Higher carbon emissions lead to a rise in temperature, which exacerbates global warming. Therefore, this option is **not a correct approach** to reduce global warming.

2. **Evaluate Option (ii): Improving efficiency of energy usage**
- Improving the efficiency of energy usage is a positive approach. By using energy more efficiently, we can reduce the overall consumption of energy and consequently lower carbon emissions. This helps in mitigating global warming. Thus, this option is **a correct approach**.

3. **Evaluate Option (iii): Afforestation**
- Afforestation involves planting trees, which helps absorb carbon dioxide from the atmosphere. This process reduces the amount of greenhouse gases, thereby contributing to the reduction of global warming. Hence, this option is **a correct approach**.

4. **Evaluate Option (iv): Increasing growth of human population**
- An increasing human population leads to higher demands for resources, which often results in increased energy consumption and higher carbon emissions. This would contribute to global warming rather than reduce it. Therefore, this option is **not a correct approach**.

### Conclusion:
The correct approaches to reduce global warming from the provided options are:
- (ii) Improving efficiency of energy usage
- (iii) Afforestation