EMMA ALBERICI, PRESENTER: The man in charge of Australia's $70 billion Future Fund today fired a broadside at the carbon tax which will be introduced in July.

David Murray has managed the Future Fund for the past six years and ends his term as chairman on Monday.

The former Commonwealth Bank chief said the carbon tax will make Australia's energy exports less competitive in the future.

DAVID MURRAY, FUTURE FUND CHAIRMAN: In the case of the carbon tax, if you want me to tell you my view, it is the worst piece of economic reform I have ever seen in my life in this country. The consequence of introducing that tax at that level in Australia today is very, very bad for this economy, particularly in terms of its international competitiveness

EMMA ALBERICI: Mr Murray was dismissed by the Treasurer Wayne Swan as a man who doesn't understand the economics of clean energy.

WAYNE SWAN, TREASURER: Well, Mr Murray is a well known opponent of the science of climate change, and the Government takes its advice from scientific bodies like the CSIRO. And we take the whole challenge of climate change as an economic and an environmental issue, very seriously.

EMMA ALBERICI: Mr Murray has previously said there is no link between carbon dioxide and global warming.