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He is not a paleoclimatologist, nor has had any formal training in the field.

He is a TV actor, turned geologist, turned documentary actor. http://en.wikipedia.org/wiki/Iain_Stewart_(geologist)

His documentaries on global warming regurgitate much of the same tripe as seen elsewhere. He adds nothing of scientific merit to the discussion. He is an actor with a degree filling a role.

Not really someone to be quoted as an expert.