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Comprehension: The Earth is getting warmer, and the oceans are rising. Why is it happening so? One answer is that it could simply be a part of a natural process. After all, there have been ice ages and long periods of warmth in the past. However, now scientists believe that human activity is the cause. For more than 200 years, human activities have changed drastically (i) (for example, industrial pollution), which have contributed to creating a layer in the atmosphere around the Earth like a giant glass container, affecting the temperatures. Unwariness (ii) of humans may lead to a big global catastrophe in the future, harmful not only to the existence of humanity but to other living and non-living beings too.
Option B is the correct answer. It reflects the paragraph's central idea: over the past two centuries, human activities have significantly altered the atmosphere, contributing to global warming.
Option A is incorrect, as it contradicts the passage’s main claim: while some may think warming is natural, scientists now believe human activity is the cause.
Option C has a subtle distortion. The paragraph warns that the unwariness of humans may lead to harm—not necessarily the activities themselves. This option shifts the emphasis away from the intended idea, which focuses on negligence or lack of caution, not direct causation by activity.
Option D: While industrial pollution is given as an example of harmful human activity, the passage does not say that pollution has drastically increased. It says human activities have changed drastically, which is a broader and more general statement.
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