Greens question trusting Abbott in negotiations

Is Milne laying the groundwork for an election? This would seem a strange thing to say otherwise, if she was planning long negotiations with the budget? She's basically poured water over any chance at them succeeding before they've even started.

Milne uses an example of the world heritage listings in Tasmania:

"It was with regard to Tasmanian World Heritage area, where the PM had [said] he was going to withdraw the area from World Heritage listing," she told ABC News Breakfast. 

"I said to him it would be a very bad idea. He said, 'Oh, I've never said that'. He said, 'What's locked up is locked up'. He would just oppose anything more being protected. 

"And then within weeks the Federal Government submitted to the World Heritage Centre in Paris its intention to withdraw 74,000 hectares. 

"So you simply can't deal with a PM who tells you one thing, then does another. 

"You have to act in good faith and you have to be able to trust people. And it's clear from that, that I wouldn't be able to trust what the Prime Minister had to say." more

So if the Greens don't trust Abbott not to lie in negotiations, how can these negotiations go forward at all?