Correct Option (D):
All three substances listed contribute to the warming of the atmosphere:
- Soot (Black Carbon): Soot is a short-lived climate pollutant that absorbs solar radiation. This absorption leads to atmospheric heating and contributes to the melting of ice and snow, thereby accelerating global warming.
- Sulphur hexafluoride (SF₆): SF₆ is a powerful synthetic greenhouse gas with an extremely high Global Warming Potential (GWP). It has a very long atmospheric lifetime and is primarily used in industrial applications, such as electrical insulation.
- Water vapour: Water vapour is the most abundant natural greenhouse gas in the atmosphere. It plays a crucial role in the Earth's climate system. An increase in atmospheric temperature leads to more water evaporating, which then traps more heat, creating a positive feedback loop that amplifies warming.
Incorrect Options:
Option 1 is incorrect because it excludes water vapour, which is a major greenhouse gas and a significant contributor to atmospheric warming.
Option 2 is incorrect as it omits both soot and sulphur hexafluoride, which are established contributors to atmospheric warming through different mechanisms.
Option 3 is incorrect because it does not include soot, a significant short-lived climate pollutant that contributes to atmospheric heating.