Which one of the following is a source of energy but does not cause pollution ?

Options

A. Gasoline
B. Nuclear power plants
C. Fossil fuels
D. Sun

Answer

To solve the question "Which one of the following is a source of energy but does not cause pollution?" we can analyze each option provided:

1. **Gasoline**:
- Gasoline is a fossil fuel that is burned to produce energy.
- When gasoline is burned, it releases carbon dioxide (CO2), nitrogen oxides (NOx), and other pollutants into the atmosphere, contributing to air pollution.

2. **Nuclear power plant**:
- Nuclear power plants generate energy through nuclear fission.
- While they do not emit greenhouse gases during operation, they produce radioactive waste, which poses environmental and health risks, thus contributing to pollution in a different form.

3. **Fossil fuel**:
- Fossil fuels include coal, oil, and natural gas.
- The combustion of fossil fuels releases harmful pollutants, including sulfur dioxide (SO2), carbon monoxide (CO), and particulate matter, leading to significant air pollution.

4. **Sun**:
- The sun is a source of solar energy.
- Solar energy is harnessed using solar panels and does not produce any pollutants during energy generation.
- It is considered a renewable and clean source of energy.

After analyzing all the options, we can conclude that the correct answer is:

**Answer: 4. Sun**