One of the federal government's most prominent climate-change deniers has billed taxpayers for a series of books that argues global warming is a hoax.

MPs are allowed to buy publications including books, journals, magazines and newspapers as part of their taxpayer-funded allowances.

National MP George Christensen, pictured with Prime Minister Tony Abbott, has charged taxpayers for books on climate-change denialism. Credit:Andrew Meares

Queensland National MP George Christensen's latest expenses filed with the Finance Department show that he bought three books on climate-change denialism: The Greatest Hoax: How the Global Warming Conspiracy Threatens Your Future; Tower of Babble: How the United Nations Has Fuelled Global Chaos; and Taxing Air Australia.

Mr Christensen has previously told a sceptics conference in the United States that climate change is like a science-fiction-cum-comedy film plot.