Greens leader Nick McKim announced on Saturday the party would not move against Labor but Mr Booth said if Labor moved to financially or legislatively support the Tamar Valley pulp mill then he would move a motion of no confidence.

Mr Booth said his colleagues had not indicated which way they would vote if he moved the motion.

"They're keeping their powder dry," he said.

Mr Booth also said at this stage the motion was hypothetical, as Labor had not made any moves to help Gunns build the pulp mill, either with infrastructure support or financial support.

The Bass Greens MHA announced on Thursday that he would be prepared to bring down the government if Labor moved to support the pulp mill.

He said the response from supporters had been "overwhelming".

"(There has been) an avalanche of support," he said.

Mr Booth said the pulp mill was an "absolutely core, fundamental issue" for the Greens, and one the party could not turn its back on.

Mr McKim said all five Green MHAs were passionate about refusing to support the Gunns pulp mill.

He said he was relaxed about Mr Booth's position if Labor moved to help Gunns get the mill built.

Mr McKim announced yesterday the Greens would move to repeal the Pulp Mill Assessment Act 2007 in the upcoming session of Parliament, which he said would mean an end to the proposed mill.

"The Gunns mill permits would be revoked, and it would also send a strong message to any potential financiers that there is no social licence for this project," he said.

Opposition Leader Will Hodgman said it sounded like Mr McKim was prepared to support the pulp mill in exchange for ending native forest logging.

"The Tasmanian Liberals believe that we can have a pulp mill as well as a sustainable native forestry industry and that we don't need to trade off one - and thousands of jobs in the process - for the other," he said.