Read the excerpt from "Climate Change: An Overview.” Roger Revelle, an American oceanographer, wrote, "Human beings are now carrying out a large-scale geophysical experiment." Scientific consensus grew around the theory of global warming, and the first United Nations environment conference was held in 1972. Which best describes Revelle’s viewpoint?
Answer
A
People are purposefully trying to change the earth’s climate.
B
People are not responsible for changes in the earth’s climate.
C
People are not able to understand the magnitude of climate change.
D
People are responsible for causing the earth’s climate to change.
Explanation
Revelle’s phrase “carrying out a large-scale geophysical experiment” suggests that human actions are affecting the Earth on a vast scale. It does not mean people are deliberately trying to change the climate; rather, people are responsible for causing it to change. Therefore, the best choice is “People are responsible for causing the earth’s climate to change.”
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