Global warming is related to the following set of gases:
- Methane: Methane is a greenhouse gas that is emitted through natural and human activities. It is produced by the decay of organic waste in landfills, agriculture, and the digestive systems of animals.
- Carbon dioxide: Carbon dioxide is the most well-known greenhouse gas and is primarily released through the burning of fossil fuels such as coal, oil, and natural gas. It is also emitted through deforestation and other land-use changes.
- Nitrous oxide: Nitrous oxide is a powerful greenhouse gas that is released through agricultural and industrial activities, as well as the burning of fossil fuels and solid waste.
- Water vapor: Water vapor is the most abundant greenhouse gas in the Earth's atmosphere. While it is not directly emitted by human activities, it is affected by changes in temperature and can amplify the effects of other greenhouse gases.
Other gases that contribute to global warming but are not mentioned in the options:
- Ozone: Ozone is a greenhouse gas that is primarily found in the Earth's stratosphere, where it plays a crucial role in protecting us from harmful ultraviolet radiation. However, at ground level, ozone is a pollutant and a greenhouse gas that is formed through the interaction of sunlight, nitrogen oxides, and volatile organic compounds.
- Sulphur dioxide: Sulphur dioxide is not a greenhouse gas but rather a pollutant that is primarily emitted through the burning of fossil fuels, particularly in power plants and industrial processes. It contributes to air pollution and acid rain but does not have a significant impact on global warming.
- Chlorofluorocarbons (CFCs): CFCs are synthetic compounds that were once widely used in refrigeration, air conditioning, aerosol propellants, and foam-blowing agents. They have been phased out under the Montreal Protocol due to their destructive impact on the ozone layer. While CFCs are not greenhouse gases, they are potent contributors to ozone depletion.
In conclusion, the set of gases related to global warming includes methane, carbon dioxide, nitrous oxide, and water vapor. While other gases such as ozone, sulphur dioxide, and chlorofluorocarbons have environmental impacts, they do not significantly contribute to global warming.

Greenhouse Gases and Global Warming

Global warming is primarily caused by the increase in greenhouse gases in the Earth's atmosphere. These gases trap heat from the sun, leading to a rise in global temperatures. Among the different sets of gases mentioned, the set that is related to global warming is:

Methane, carbon dioxide, nitrous oxide, water vapour

Methane: It is a potent greenhouse gas emitted from sources like livestock, agriculture, and landfills. Methane traps heat in the atmosphere and contributes to global warming.

Carbon dioxide: This is the most abundant greenhouse gas and is mainly produced by burning fossil fuels like coal, oil, and natural gas. Carbon dioxide levels have been rising due to human activities, leading to an enhanced greenhouse effect.

Nitrous oxide: This gas is released from agricultural and industrial activities. It contributes to global warming by trapping heat in the atmosphere and depleting the ozone layer.

Water vapour: While water vapour is not directly emitted by human activities, it acts as a feedback mechanism in the Earth's climate system. As the atmosphere warms due to other greenhouse gases, it can hold more water vapour, leading to further warming.

In conclusion, the set of gases including methane, carbon dioxide, nitrous oxide, and water vapour are closely related to global warming as they contribute to the greenhouse effect and the rise in global temperatures.