Asmall number of scientists disagree that global climate change is caused by human activity. however, scientific consensus supports the idea that human activity is affecting climate. this is possible because. a) scientific consensus does not require the agreement of all scientists. b) the idea is an emerging scientific idea that has not been tested repeatedly. c) the idea that global climate change is caused by human activity is a scientific theory. d) scientific consensus does not require a large number of scientists to support an idea.