Family First Senator Steve Fielding has made up his mind on global warming - there's not enough evidence that it's real.

After talks with the Government and top scientists, Senator Fielding, who holds a crucial Senate vote, has released a document setting out his position.

"Global temperature isn't rising," it says.

On emissions trading, Senator Fielding said he wouldn't risk job losses on "unconvincing green science".

The document was prepared with the help of some of the country's most prominent climate-sceptic scientists.