The Australian Greens say Tony Abbott must come clean about his cruel cuts before voters go to the polls in elections around the country.

"How can we trust a Prime Minister who deliberately withholds information before an election?" asked Australian Greens Leader Christine Milne.

"Tony Abbott is deliberately hiding his true agenda for cruel cuts. He is being mean, tricky and secretive.

"It's completely obvious the PM is holding out until after the upcoming elections in an attempt to pull the wool over voters' eyes.

The Australian Government will continue to receive independent advice on climate policy and the RET, now the Greens in the Senate have blocked the abolition of the independent Climate Change Authority.

"It's ridiculous that Tony Abbott is blocking action on global warming, and undermining renewable energy, by rejecting the experts who can tell him how to maximise opportunities," said Greens Leader Senator Christine Milne.

Australian Greens Leader Senator Christine Milne has used her speech at the Australian Greens campaign launch to warn of the risk of Tony Abbott taking control of both houses of parliament.

"Australian voters do not want any party to have absolute power in the parliament," Greens Leader Senator Christine Milne said.

"The last time this happened John Howard introduced Work Choices.

"We have a vision for our nation and the courage to stand up for issues that matter - something the old parties lack.

The Australian Greens have unveiled plans for fixed terms with the first Saturday in Spring to become the permanent election date every 3 years.

Australian Greens Leader Senator Christine Milne said: "The Greens plan for fixed terms, with a set election date every 3 years, would end the uncertainty over election timing for good and prevent the blatant partisan abuse and manipulation of election timing.

The Australian Greens have welcomed the Prime Minister's decision to announce the federal election date.

"I am delighted the Prime Minister has ended the uncertainty by telling Australians when they will be heading to the ballot box," Greens Leader Senator Christine Milne said.

"While Kevin Rudd and Tony Abbott continue to fight each other in a race to the bottom on important issues like climate change and asylum seekers, the Greens are standing up for what matters.