Aussie Chief Scientist: “We have [climate] models to try to predict what that will be and that’s difficult”

WUWT
One Nation Federal Senator and hardcore climate skeptic Malcolm Roberts, who recently skewered TV Physicist Brian Cox on national TV, has demanded the Australian Chief Scientist provide evidence that humans cause climate change. The response so far is less than confident.   ......
I suspect this challenge is going to get very uncomfortable for Australia’s chief scientist.
Malcolm Roberts, a qualified and highly experienced mining engineer, is one of the few elected Australian politicians with the skill and meticulous attention to detail required to dissect anything the bureaucrats who run government science organisations can throw at him.
His demand for proof that humans cause warming has struck at the weak point of the entire AGW scare campaign – because there isn’t any proof available to provide. Just a load of conjecture, based on a weak set of models which don’t work very well.
Most people agree that adding CO2, considered in isolation, should produce a mild warming effect. But the entire climate scare campaign is based on models which assume that the initial warming effect from anthropogenic CO2 is dramatically amplified by feedback, by climatic responses to the initial warming.
The problem is there is no evidence this amplification is actually occurring – models which assume amplification perform woefully when compared to real world observations, far worse than models which assume no amplification, or very little amplification."