Richard Denniss argued with a tired old adage, borrowed from some of the paid smogging sites about cancer and how if you shopped around the consensus would be that you needed some form of cancer treatment.
So, Mr Denniss, how about this? If, in the year 1980, you sought medical help for a peptic ulcer, the "consensus" would have been that they were caused by stress. You could go to doctor after doctor, specialist after GP and all would have said stress caused your peptic ulcer.
However two Australians, Robin Warren, a pathologist from Perth and Barry Marshall from Kalgoolie WA, isolated an up until then unknown bacterium:
From Nobel Prize.org Press Release)
By using technologies generally available (fibre endoscopy, silver staining of histological sections and culture techniques for microaerophilic bacteria), they made an irrefutable case that the bacterium Helicobacter pylori is causing disease. By culturing the bacteria they made them amenable to scientific study.
In 1982, when this bacterium was discovered by Marshall and Warren, stress and lifestyle were considered the major causes of peptic ulcer disease. It is now firmly established that Helicobacter pylori causes more than 90% of duodenal ulcers and up to 80% of gastric ulcers. The link between Helicobacter pylori infection and subsequent gastritis and peptic ulcer disease has been established through studies of human volunteers, antibiotic treatment studies and epidemiological studies.
Sometimes, Mr Denniss, a "consensus", like a verbal contract, is not worth the paper it is written IN.
UPDATE - Roy Morgan Poll.
to his view that ‘Concerns about Global Warming are exaggerated’