The Coalition is struggling to win business support for its climate plan, with no company chiefs signed up to spruik it as a better way to cut carbon dioxide emissions than a carbon tax.

Last month former Reserve Bank board member Dick Warburton said he had agreed to assemble a team to promote the Coalition's plan for a $10 billion fund to pay for emissions cuts, and that he expected to make an announcement about it in mid-March.

But Mr Warburton has told The Age that he is yet to convince any business leaders to join a Coalition round table to promote its climate policy.

''There has been progress with various business leaders who are very supportive, but many of them would rather remain anonymous because they don't want to be seen as partisan,'' he said this week.

The battle to attract business support followed the Coalition's failure to win backing from economists for its direct action plan as a viable long-term alternative to a carbon tax or emissions trading scheme.