Greens Leader Richard Di Natale says it's time for Prime Minister Turnbull to articulate a timetable for Australia becoming a republic.

"There's never been a better time for Australia to become a republic," Senator Di Natale said.

"For the first time, all three federal political leaders are in favour of a republic, and with the state and territory leaders declaring their support, there's huge momentum.

"Malcolm Turnbull was the head of the Australian Republican Movement, so it's time for him to show leadership on the issue now that he's Prime Minister.

The Australian Greens have welcomed Malcolm Turnbull's departure from the divisive and aggressive language of Tony Abbott, calling on the new Prime Minister to match his words with his actions.

"I agree with the Prime Minister that as political leaders we must continue to champion multiculturalism and unite the community against this threat that feeds on division and fear," said Greens Leader Richard Di Natale.

"The change of rhetoric is welcome but it's important that the decisions of the Prime Minister reflect his words.

The Australian Greens have welcomed the Syrian refugees beginning to arrive under Australia's emergency intake, cautioning the world against lashing out in anger over the horrific attacks in Paris.

"A united Australian community is much stronger in helping to defeat these threats than one that's divided. Hate is the problem here, it's not the answer," said Greens Leader Richard Di Natale.

"As a community we need to recognise that the people seeking refuge in Australia are fleeing the kind of violence and barbarism that we've seen in Paris.

Australian Greens Leader Richard Di Natale and NSW Greens Senator Lee Rhiannon:

On behalf of the Australian Greens we extend our condolences to the families and friends of Richard and Carolyn Green and John Davis.

I was pretty surprised and disappointed to see myself paraphrased saying I'd join forces with the Libs if it meant the Greens could win a seat.

I didn't say that and I would never say that.

We are poles apart from the Liberals on most things, and more often than not you will find the Liberals and Labor teaming up on a wide range of issues, from preference deals that stop Greens winning seats, to locking up young kids in detention and supporting new coal mines that fuel dangerous global warming.

Australian Greens Leader Richard Di Natale has welcomed the abolition of knights and dames from the Order of Australia, but says Australians deserve so much more from their new Prime Minister.

"I'm pretty underwhelmed that Malcolm Turnbull's first big break from Tony Abbott is on the matter of honorifics," Senator Di Natale said.

Robert Simms has been sworn in this morning as the Australian Greens' new Senator for South Australia, replacing Penny Wright who stood down for personal reasons earlier this year. Senator Simms will make his first speech to the Senate at 5pm on Tuesday 13 October.

"It's a great privilege to be able to represent my state of South Australia and carry on the good work that Penny Wright did as Senator," said Senator Simms.

"I am excited to be part of such a strong team and look forward to working closely with my new Greens colleagues.

The Greens have today called for the community to come together in the wake of the brutal shooting of police accountant Curtis Cheng outside the police headquarters in Parramatta on Friday afternoon.

“My heartfelt thoughts and condolences go out to the family and friends of Curtis Cheng and Farhad Khalil Mohammad Jabar,” said Richard Di Natale, leader of The Australian Greens.

“This is tragic event. A fifteen year old boy committing such a hateful act will have a deep impact on our national psyche.