Institution: Bank Asia Ltd Exam: Bank Asia Ltd - Management Trainee Officer - 22.05.2015 ||
Topic: Correction (Sentence Correction), Subject: English Grammar (ইংরেজি গ্রামার)

Best Answer Explained in Below-:

The main cause of global warming, as indicated in the question, is the emission of carbon dioxide (CO2). This greenhouse gas is primarily released through human activities such as burning fossil fuels (coal, oil, and natural gas) for energy, transportation, and industrial processes. When CO2 accumulates in the atmosphere, it traps heat from the sun, leading to an increase in the Earth’s average temperature—a phenomenon known as the greenhouse effect.

While options A, C, and D—rising sea levels, melting ice caps, and frequent droughts—are significant consequences of global warming, they are not its primary causes. These effects result from the warming itself, which is driven by the elevated concentration of greenhouse gases, particularly CO2. The scientific consensus highlights that addressing CO2 emissions is crucial for mitigating climate change and its ensuing impacts on weather patterns, ecosystems, and sea levels. Thus, option B not only identifies the primary driver of global warming but also points towards a critical area for intervention to combat climate change.