Reid Bryson is a climatologist. In fact he's been credited with the invention of climatology as an academic subject. It has been suggested that he is the most widely cited climatologist there is.
And what has he got to say about global warming?
“All this argument is the temperature going up or not, it’s absurd. [...] Of course it’s going up. It has gone up since the early 1800s, before the Industrial Revolution, because we’re coming out of the Little Ice Age, not because we’re putting more carbon dioxide into the air.”