Anyone who knows me knows that consensus is usually the last evidence I consider. In fact, consensus tends to make me suspicious. It gives everyone an excuse to support stupid things, like Harry Potter (forgive me).
Consensus is often cited in support of scientific paradigms, including anthropogenic climate change. Australian physicist Tom Quirk has neatly dissected the consensus argument for the human role in climate change in an article in Quadrant Online entitled “Of climate science and stomach bugs.” This curiously entitled piece begins with the story of how Australians Barry Marshall and Robin Warren revolutionized the treatment of stomach ulcers in 1982 when they discovered that peptic ulcers are mainly caused by a bacterium.