Australian Greens Leader Richard Di Natale has laughed at Prime Minister Malcolm Turnbull's assertion that that a re-elected Coalition would deliver stable government.

"Malcolm Turnbull rolled a first-term prime minister, presides over a divided party room with Tony Abbott waiting in the wings, and called a double dissolution in a desperate bid to earn a mandate from his own party," Senator Di Natale said.

The Australian Greens have formally launched their 2016 campaign with the entire federal Greens party room, former party leaders Bob Brown and Christine Milne, and hundreds of supporters in Melbourne.

"I am so proud to lead this party that has the courage and vision to stand up for what matters," said Greens Leader Richard Di Natale.

"Our 2016 federal election campaign is focused on protecting the climate that sustains our health, our environment and our economy, tackling inequality and charting a better way to deal with today's record levels of global displacement.

"The Australian Greens respect the vote of the British people today but we share in the disappointment of our UK Greens colleagues who campaigned strongly for the UK to remain in the EU," said Australian Greens Leader Richard Di Natale.

"The result highlights the need to bring people together if we want to be an outward focussed and confident nation that works for the common good.

"Instead the Prime Minister is launching another scare campaign to further lower the tone of an election campaign that is near rock bottom.

The Australian Greens have welcomed the election being called today, saying Australians deserve better than the double-disappointment they're getting from the Liberal-National Coalition and Labor.

"Global warming, the unprecedented number of people seeking asylum around the world, inequality, transforming our economy: these are the challenges of our time and it's the Greens who are providing leadership," said Australian Greens Leader Richard Di Natale.

Greens Leader Richard Di Natale visited a local medical centre with rooftop solar today, on the campaign trail with Greens candidate for Canning Dr Vanessa Rauland.

"People here have a choice: you can stick with the past and vote for Tony Abbott, or you can choose a clean, renewable, jobs-rich, pollution-free future. That's what the Greens are putting forward to the people of Canning," said Senator Di Natale.

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.