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 able to understand the magnitude of climate change.
C
People are responsible for causing the earth’s climate to change.
D
People are not responsible for changes in the earth’s climate.