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