The correct answer is option 4, which means that all of the given options, 1, 2, and 3, contribute to the warming up of the atmosphere.
Soot, which is a black carbon particle, is produced from the incomplete combustion of fossil fuels, biomass, and other organic matter. When soot particles are present in the atmosphere, they absorb sunlight and can cause local heating.
Sulphur hexafluoride (SF6) is a greenhouse gas that is commonly used in electrical equipment and has a high global warming potential. SF6 has a long atmospheric lifetime, meaning that it stays in the atmosphere for a long time and contributes to the greenhouse effect.
Water vapor is a naturally occurring gas in the atmosphere and is the most abundant greenhouse gas. It plays a crucial role in the Earth`s climate system. As temperatures increase, more water vapor can be held in the atmosphere, leading to a positive feedback loop where increased water vapor causes further warming.
Therefore, all three options, soot, sulphur hexafluoride, and water vapor, contribute to the warming up of the atmosphere.