Question

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 revelles viewpoint? people are responsible for causing the earths climate to change. people are not able to understand the magnitude of climate change. people are purposefully trying to change the earths climate. people are not responsible for changes in the earths climate.

Explanation:

Roger Revelle's statement "Human beings are now carrying out a large - scale geophysical experiment" implies that human actions (which are the actions of people) are having an impact on the Earth's systems. This is in line with the idea that people are responsible for causing the Earth's climate to change. The other options are not supported by the given statement. There is no indication in the statement about people's inability to understand climate change magnitude (no mention of understanding in the quote). Also, there is no evidence that people are "purposefully" trying to change the climate (the experiment could be unintentional due to activities like burning fossil fuels etc.). And the statement clearly shows human involvement, so the option that people are not responsible is incorrect.

Answer:

People are responsible for causing the earth’s climate to change.