A consequence of global warming is

1. Analyze the question The question asks for a consequence of global warming, meaning an effect that results from the Earth's average temperature rising. It is not asking for a cause.

2. Explain the concept Global warming is the gradual rise in Earth's average temperature. It is caused mainly by greenhouse gases such as CO₂, CH₄, and N₂O, which trap heat in the atmosphere (the greenhouse effect).

The main consequences are:

• Melting of polar ice caps and glaciers
• Rising sea levels
• Flooding of coastal and low-lying areas (as in the Niger Delta and Lagos)
• Changes in rainfall patterns, with more droughts and heavy rains
• Desertification and loss of biodiversity

3. Evaluate the options

• A. Air pollution: This is mostly a cause of global warming (e.g., emission of CO₂ and other gases), not the main consequence.
• B. High humidity: Warmer air can hold more moisture, so humidity may increase locally. However, this is a minor effect and not the classic textbook consequence.
• C. Flooding: Melting ice caps and rising sea levels, along with intense rainfall, cause flooding. This is the standard textbook consequence.
• D. Water pollution: This comes mainly from sewage, oil spills, and industrial waste, not directly from global warming.

4. Answer The correct option is C. flooding.

5. Exam tip For "consequence of global warming" questions, think: heat → ice melts → sea level rises → flooding. If you see "flooding", "rising sea level", or "melting ice caps" among the options, those are usually the answer. Also remember that pollutants like CO₂ are causes, while flooding and drought are effects.