global warming consensus?

I remember hearing or reading a year or so ago, from a source I
thought credible, about scientific opinion on global warming. The
main point that stuck with me was the claim that it is an
overrepresented minority of climate scientists that believe that
global warming has anything to do with humans. I thought this figure
was around 9%.

I thought this had come from a Stossell special or from an episode of
Penn & Teller's "Bullshit", but I could be mistaken. Does this sound
familiar to anyone?