CARDINAL GEORGE PELL has rebuffed the head of the Bureau of Meteorology, who had said Australia's highest-ranking Catholic was ''misled'' in his views on global warming.

Dr Greg Ayers told a Senate estimates hearing last month that the Archbishop of Sydney's argument against human-induced climate change was based heavily on a book by Ian Plimer, Heaven and Earth - Global Warming: The Missing Science, which had been discredited by scientists.

''The contents of the book are simply not scientific. I am concerned that the cardinal has been misled [by its contents],'' the director of the bureau said.

But Cardinal Pell told the Herald the statements by Dr Ayers, an atmospheric scientist, were themselves unscientific. ''Ayers, when he spoke to the House, was obviously a hot-air specialist. I've rarely heard such an unscientific contribution.''

The cleric, who has questioned global warming in his Sunday newspaper column, even likened himself to the federal government's climate adviser Ross Garnaut when he expressed disappointment last week that the public debate on climate change was often divorced from scientific quality, rigour and authority.