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.