Step 1: Understanding the greenhouse effect.
The greenhouse effect refers to the process by which certain gases trap heat in the Earth's atmosphere, leading to global warming. These gases are commonly referred to as greenhouse gases.
Step 2: Analyzing the options.
- (A) Chlorine: Chlorine is not primarily responsible for the greenhouse effect. It is more known for its role in the depletion of the ozone layer.
- (B) Sulphur dioxide: Sulphur dioxide is not a significant greenhouse gas. It can contribute to air pollution, but it does not have a major role in global warming.
- (C) Fluorine: Fluorine compounds, like CFCs, contribute to ozone depletion but are not the primary cause of the greenhouse effect.
- (D) Carbon dioxide: Carbon dioxide (CO2) is the primary greenhouse gas responsible for trapping heat in the atmosphere and is a major contributor to global warming.
Step 3: Conclusion.
The correct answer is (D) Carbon dioxide, as it is the main greenhouse gas responsible for global warming.