percentage of scientists who believe climate change is real
On his Twitter account, President Obama tweets: “Ninety-seven percent of scientists agree: #climate change is real, man-made and dangerous.” Not only does Obama sloppily equate “scientists” with “climate scientists,” but more importantly he added “dangerous” to the 97% claim, which is not there in the literature.
Various surveys have been conducted to evaluate scientific opinion on global warming. They have concluded that the majority of scientists support the idea of anthropogenic climate change. In 2004, the geologist and historian of science Naomi Oreskes summarized a study of the scientific literature on climate change.