FORMER Australians Greens leader Bob Brown has re-entered the political fray to attack the Queensland government's environmental performance.

Dr Brown, who retired from the Senate earlier this year, said he has serious concerns about the direction the state is heading under Premier Campbell Newman.

"This is an age of mega-developments with huge firepower behind them, so that Campbell Newman has become an even greater threat to Queensland's environment than (former premier) Joh Bjelke-Petersen," he told reporters in Brisbane on Friday.

"Campbell Newman is seeing the environment as a cost on coal, not coal as a cost on the environment."

Dr Brown and Queensland Greens Senator Larissa Waters sent Queensland Premier Campbell Newman's office a picture of a cassowary to remind him of the importance of the environment.

"I hope it's got pride of place in his office," Senator Waters said.

Originally published as Bob Brown whacks Newman over environment