Greens Leader Bob Brown has described the proposed dam as "the most damaging project that's conceivable", even though it was Green preferences to Labor in the recent Queensland election that allowed Labor to form government and for the dam to proceed.

"If Senator Brown is sincere in his comments, he has the political power to stop the dam now by telling Anna Bligh and Kevin Rudd that The Greens will not entertain any preference deal with the Labor Party until they axe the dam," Mr Truss said.

"Anna Bligh does not care about the environment, but she and Mr Rudd do care about votes.

"I would like to think that Senator Brown cares more about the environment than his relationship with the Labor Party."

Mr Truss said there were no strategies that could prevent devastation being wreaked upon the endangered Mary River Cod, Mary River Turtle, Giant Barred Frog and the vulnerable Queensland Lungfish should the dam proceed.

"Brisbane’s water crisis is of Anna Bligh’s creation, and in spite of Anna Bligh’s recent spin and hysteria, there are better and cheaper alternatives available to supply water to Brisbane, which make the Traveston Crossing dam unnecessary," Mr Truss said.