Deputy Prime Minister Wayne Swan has refused to rule out changes to Labor's carbon pricing scheme, amid reports the Government is considering dumping the floor price from the policy.

The $15 per tonne minimum price is due to come into effect once the carbon tax transitions to a fluctuating market-based scheme in 2015.

But there is growing pressure on the Government to alter the agreement it struck through the Multi-Party Climate Change Committee, because of concerns about linking the Australian scheme to the international market, and the current low carbon price in Europe.

The ABC has been told Labor is considering dumping the floor price or significantly modifying it, despite public reassurances from Climate Change Minister Greg Combet that "we intend proceeding with what we agreed".

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The Government is currently in negotiations with the Greens and other MPs about how the floor price will work.

At a press conference in Brisbane this morning, Mr Swan was asked several times about whether the Government was considering changes to the floor price.

But he sidestepped the issue, by instead continually referring to the period of time before the floor price is due to take effect.

"We have got a fixed price for the next three years," Mr Swan told reporters.

Prime Minister Julia Gillard declined to elaborate, saying "we're consulting on the floor price and there's nothing new in that".

'Chaos and confusion'

The Coalition is demanding the Government reveal any proposed changes to the policy, describing the current situation as one of "complete chaos and confusion".

"The carbon tax has only been in place for five days, and already they're talking about how to fix it," Opposition Leader Tony Abbott said.

Key independent MP Rob Oakeshott has been vocal in his push to have the floor price dumped from the scheme.

He says he is "listening closely" to concerns that having a floor price may affect market confidence and Australia's ability to link the scheme to the international carbon market.

"We are still having a conversation amongst friends of an emissions trading scheme," Mr Oakeshott told ABC Radio National yesterday.

But the Greens are insistent that a floor price is needed to help drive investment in low-carbon technology.

Greens Senator Scott Ludlam says there would be significant problems if the price fell below a threshold such as $15.

"Firstly, it's not raising the revenue that you need to support the new industries coming through, and secondly, it doesn't act as a disincentive," Senator Ludlam told ABC News 24.