I have never met a scientist who is not deeply concerned about global warming,
That's a deeply flawed statement. Not every scientist is qualified to comment on global warming - only scientists who actually specialize in this field. The beliefs of other scientists carry just as much weight as those of the general public.
In the same way, someone who is an expert in climate science may not be an expert in public policy making.
and the irony here is that the ones who are qualified have HUGE incentive to be biased. moral of the story, don't appeal to any authority.