Dr. William Gray, the late Colorado State University climate scientist and founder of the Hurricane Forecast, was the only serious, peer reviewed and respected scientist I know of who didn't think anthropomorphic climate change was real- and in fact never took any money from anyone to come to his conclusion.
That said, every one of his justifications was rigorously investigated and found to be either false or irrelevant. They took him seriously because of his groundbreaking work in hurricane forecasting- the guy's name was a household word in South Florida- and so they ran down every possibility. Turns out that on this point he was just plain wrong. Look it up sometime, it's a fascinating story.
That's how science works.