You could characterize it that way, but realize also that if the set of the "in group" is people whose livelihoods are based on finding evidence for AGW theory

You could characterize it that way, but realize also that if the set of the "in group" is people whose livelihoods are based on finding evidence for AGW theory and those in the "out" group are those who don't, then the set of people is the same as the set of theories.