Which of the following processes is held responsible for global warming?

Correct option is A

Sol. The greenhouse effect is the primary process responsible for global warming. It occurs when greenhouse gases (CO₂, CH₄, N₂O, and water vapor) trap heat in the Earth's atmosphere, leading to a rise in global temperatures. This effect is intensified by human activities such as burning fossil fuels and deforestation.
Explanation of each option:
· (a) Greenhouse effect – Correct answer. The trapping of heat by greenhouse gases in the atmosphere leads to rising temperatures, melting glaciers, and climate change.
· (b) Fire in coal mines – Incorrect. Although underground coal mine fires release carbon dioxide and methane, they are not the main cause of global warming.
· (c) Dry farming – Incorrect. This is a farming method used in arid and semi-arid regions that conserves moisture but does not contribute significantly to global warming.
· (d) Monsoon – Incorrect. The monsoon is a natural climatic phenomenon driven by seasonal wind patterns, not a cause of global warming.