and the opinion of 97% of the world's experts.
I know, 75/77 is pretty serious!!
Reviews of scientific opinion
An essay in Science surveyed 928 abstracts related to climate change, and concluded that most journal reports accepted the consensus.[65] This is discussed further in scientific opinion on climate change.
A 2010 paper in the Proceedings of the National Academy of Sciences found that among a pool of roughly 1,000 researchers who work directly on climate issues and publish the most frequently on the subject, 97% agree that anthropogenic climate change is happening.[66]
A 2011 paper from George Mason University published in the International Journal of Public Opinion Research, "The Structure of Scientific Opinion on Climate Change," collected the opinions of scientists in the earth, space, atmospheric, oceanic or hydrological sciences.[67] The 489 survey respondents-representing nearly half of all those eligible according to the survey's specific standards - work in academia, government, and industry, and are members of prominent professional organizations.[67] The study found that 97% of the 489 scientists surveyed agreed that that global temperatures have risen over the past century.[67] Moreover, 84% agreed that "human-induced greenhouse warming" is now occurring."[67] Only 5% disagreed with the idea that human activity is a significant cause of global warming.[67]
As described above, a small minority of scientists do disagree with the consensus: see list of scientists opposing global warming consensus. For example Willie Soon and Richard Lindzen[68] say that there is insufficient proof for anthropogenic attribution. Generally this position requires new physical mechanisms to explain the observed warming.[69]