Question : Direction: Read the following passage and answer the questions given after it.
The science of climate change is more solid and widely agreed upon than you might think. But the scope of the topic, as well as rampant disinformation, can make it hard to separate fact from fiction. Here, we've done our best to present you with not only the most accurate scientific information but also an explanation of how we know it. Climate change is often cast as a prediction made by complicated computer models. But the scientific basis for climate change is much broader, and models are actually only one part of it (and, for what it's worth, they're surprisingly accurate).
For more than a century, scientists have understood the basic physics behind why greenhouse gases like carbon dioxide cause warming. These gases make up just a small fraction of the atmosphere but exert outsized control on Earth's climate by trapping some of the planet's heat before it escapes into space. This greenhouse effect is important: It's why a planet so far from the sun has liquid water and life! However, during the Industrial Revolution, people started burning coal and other fossil fuels to power factories, smelters and steam engines, which added more greenhouse gases to the atmosphere. Ever since human activities have been heating the planet.
Question:
For what duration of time, scientists learned the green house gases?
Option 1: more than a decade
Option 2: more than two fortnights
Option 3: more than a 20 years
Option 4: more than a century
Correct Answer: more than a century
Solution : The correct answer is option 4.
Explanation:
'More than a century,' is the correct answer.
Take a look at the first sentence of the passage's final paragraph:
'For more than a century, scientists have understood the basic physics behind why greenhouse gases like carbon dioxide cause warming.'.
According to the preceding line, scientists have known about greenhouse gases for over a century.
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