Radio Australia: The head of Australia’s peak science body has spoken out in defence of climate scientists, saying the link between human activity and climate change is beyond doubt. The head of the CSIRO, Dr Megan Clark, says the evidence of global warming is unquestionable, and in Australia it is backed by years of robust research. Dr Clark says climate records are being broken every decade and all parts of the nation are warming. “We are seeing significant evidence of a changing …