When people talk about consensus among experts instead of the actual facts, that is another red flag.

Or, like Mann, won't reveal his data to the court.  




http://www.zerohedge.com/news/2017-07-26/real-fake-news-science-used-propaganda



Correlation is not causation. This is a basic foundational tenet of science. Two things may be very strongly correlated, but that does not prove that one causes the other.