The Climate Change Authority, a newly formed body created out of the carbon pricing legislation, is a bit like a mixture of the Productivity Commission and the Reserve Bank. And it's CEO Anthea Harris who stirs the mix.
She's tasked with advising (rather than directing) the government on how fast it should reduce emissions, and the kinds of policies it should implement to do so. Ultimately the government can choose to ignore the advice. So much like the Productivity Commission, Harris' power only derives from how well she and the CCA board can argue their case in public, and the credibility which others attach to their advice.