Prime Minister Scott Morrison has conceded he caused "great anxiety in Australia" by taking a family holiday in Hawaii as bushfires burned across Australia, saying with the benefit of hindsight he would have made a different decision.

Key points: The Prime Minister spoke at a press conference in Sydney after cutting short his family holiday

The Prime Minister spoke at a press conference in Sydney after cutting short his family holiday Mr Morrison landed in Sydney on Saturday night after flying home from Hawaii

Mr Morrison landed in Sydney on Saturday night after flying home from Hawaii He said he accepted the criticism he received during his holiday

Mr Morrison on Friday announced he would cut his trip short, after the deaths of two volunteer firefighters in New South Wales.

He landed in Sydney just before 8:00pm on Saturday on a Hawaiian Airlines flight from Honolulu.

The period of leave was not formally announced, and the Prime Minister's Office refused to confirm the location or dates of leave, citing security concerns.

Mr Morrison spent Sunday morning receiving a briefing on the fire situation in New South Wales from fire chiefs and emergency service personnel at Rural Fire Service (RFS) headquarters.

At a press conference, he said he accepted the criticism about his holiday, and apologised for any upset caused.

"I have returned from leave and I know that [my holiday] has caused some great anxiety in Australia, and Jenny and I acknowledge that," he said.

"If you had your time over again and you had the benefit of hindsight then would have [sic] made different decisions."

Mr Morrison has also copped criticism for the way his office handled his trip.

Opposition Leader Anthony Albanese has said while he did not have an issue with Mr Morrison taking a pre-Christmas break, there had been a lack of transparency throughout the process.

Prime Minister Scott Morrison gets a briefing in the NSW Rural Fire Service control room. ( AAP: Joel Carrett )

Mr Morrison on Sunday said while he had followed the usual protocol surrounding private leave, changes would be implemented for the next trip.

"There have been lessons learned this week and they will be imported and included next time," he said.

PM rules out change in climate policies

During the press conference, Mr Morrison also declared the Government would not change its climate change policies, rejecting calls for a more ambitious response as fires raged through Australia.

The Government has been under pressure to develop a stronger emissions reduction target, beyond the promised 26 per cent cut by 2030.

Scott Morrison said the smoke haze from bushfires had caused the public to feel anxious about climate change. ( AAP: Dean Lewins )

But Mr Morrison defended the Government's policies on the issue, ruling out an immediate change.

"People can expect my Government to do what it promised to do, what we took to the last election," he said.

"I know there are some who've tried to make political points and score points in the midst of these disasters, and that's disappointing.

"I will do what I said I would do because that is how I am with the Australian people."

He said climate change was "one of many factors" responsible for the fires, and said the public was "anxious" about the issue because of the smoke haze blanketing parts of the country.

"I have always acknowledged the connection between these weather events and these broader fire events and the impacts globally of climate change. It's one of many factors as I have said," he said.

"I know people are anxious and I know people in some places are rightly fearful of what is literally at their door, and the haze and the smoke and all of these things heighten that anxiety as you think about your kids and your family and you can see the red tinge at night if you're close enough, but our fire services in Australia are the best in the world."

Mr Morrison reiterated his position that Australia was "carrying its weight" when it came to combatting climate change on the global stage.

His comments came after acting prime minister Michael McCormack on Saturday said Australia should take further action to address climate change.

Mr McCormack did not elaborate on what that action should look like, merely saying the Government would have discussions about what more could be done to tackle the issue.

Opposition Leader Anthony Albanese seized on the difference in rhetoric between the Coalition leaders.

"The Deputy Prime Minister [Saturday] said new measures were needed and a new response," Mr Albanese said.

"And today, going from the acting prime minister to the real Prime Minister, we have a dismissal of the need for any action on climate change.

"When it comes to climate change, the Prime Minister's attitude is 'there's nothing to see here. It's business as usual'.

"Well if he thinks there's nothing to see here, it's because he can't see through the smoke that's coming from those bushfires."