Australian Greens climate change spokeswoman Christine Milne said the Government would also have no alternative but to reverse its plan to link passage of the emissions bill to renewable energy measures.
"The [emissions trading] bill will be defeated. There is no question about that," she told ABC Television.
"The Government hasn't been able to reach a compromise with the Coalition and in terms of the Greens, the Government has not come back with more ambitious targets on the table.
"We are determined that Australia plays its fair share internationally."
Senator Milne said the UN meeting in Bonn was now declaring that the main roadblock to a global agreement at the Copenhagen climate change conference later this year was the lack of ambition from developed countries.
She said emissions reductions targets between 16-24 per cent were on the table and that was nowhere near the 25-45 per cent needed for developed countries.
Senator Milne said the Government had added a complication by tying renewable energy target legislation to passage of the emissions reduction scheme.
"The Government is going to have to back down on that because so many businesses around the country are desperate to get going with expanding renewable energy."
As we know, Family First's Stephen Fielding has been blinded by staring at the sun for too long when hanging out with fellow gullibles at the Heartland Institute of Kitchen Science and Propaganda. He's no bloody use to Labor (but at least he is more honest and open in his denial than the damned Liberals), so if Big Kev wants to get his second-best emissions scheme though, he's gonna have to bite the bullet and turn it into the first best plan.