Is the claim that all scientists believe in man made global warming and thus so should you an illegitimate appeal to authority?

It is certainly an appeal to authority to argue that you should believe in anthropogenic global warming because all (or most) scientists do! Of course, the question is, why are scientists in (almost complete) agreement? It might be because the evidence is overwhelming, but it also could be for other reasons such as peer pressure, politics, intimidation etc. So the important issue is WHY the scientists agree and, to figure this out, you need to dig more deeply into the science and the politics. You might say (if you were generally trusting of scientists)--it is a legitimate appeal to authority, but authority is fallible.

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