Select the odd one out

Question

Accepted Answer

The odd one out in the given options is:

**4. Natural gas**

### Explanation:

1. **Solar energy, Wind energy, and Tidal energy** are all forms of renewable energy. They are derived from natural processes that are replenished constantly. 
   - **Solar energy** harnesses sunlight to generate electricity or heat.
   - **Wind energy** utilizes wind to turn turbines that generate electricity.
   - **Tidal energy** captures energy from the movement of tides and waves in oceans and seas.

2. **Natural gas**, on the other hand, is a fossil fuel. It is a non-renewable energy source formed from the remains of ancient marine organisms over millions of years. While it is often considered a cleaner alternative to other fossil fuels like coal and oil, it still contributes to greenhouse gas emissions and is not sustainable in the long term.

### Summary:
- **Odd one out:** Natural gas (non-renewable)
- **Other options:** Solar, Wind, and Tidal energy (renewable)

Thus, the correct answer is **4. Natural gas** because it is the only non-renewable energy source among the options provided.