Is there a quorum of scientific opinion?
Claim: Ever since the early 1990s I have heard that climate scientists agree that global climate change is really happening and is a threat. Many people rely on the opinions of experts in their fields (I certainly do). If global climate change is indeed a majority opinion amongst experts, this to me is a strong indication that it is real.
Objection: Sometimes scientific consensus can form around something that is incorrect, due to peer pressure or conflicts of interest. Is there evidence that this is the case?
Objection: Perhaps there is not actually a consensus, and experts in the field are genuinely divided. What evidence is there for this?