Malcolm Turnbull and other G20 leaders are set to unveil a final communique that acknowledges a split over climate policy and US President Donald Trump's "America first" stance on trade.
The prime minister heads into the final day of the Hamburg summit having enjoyed a concert and dinner with other leaders on Friday night and a spontaneous meeting with Donald Trump in The Beast between functions.
Mr Turnbull says he and the US president discussed North Korea's illegal testing of missiles, among other topics.
"It was an opportunity to have a good private discussion about a number of these issues," Mr Turnbull said on Saturday.
"President Trump and I get on very well."
Mr Turnbull will head to Paris at the end of the Hamburg summit, which on Saturday is focusing on innovation, women, jobs, refugees and African development.
It is understood the summit's final statement, to be delivered by German Chancellor Angela Merkel on Saturday afternoon local time (11pm AEST), will reflect strong support for the Paris climate agreement and note Mr Trump's decision to pull out.
One paragraph, in a draft seen by news agency Reuters, says the US will "work closely with other partners to help their access to and use of fossil fuels more cleanly and efficiently".
Mr Turnbull, who during the session talked about Snowy Hydro 2.0 and the importance of energy storage, said fossil fuels would continue to be part of the energy mix of the world "for a very long time".
"The object of climate policy is to reduce net emissions - it's not to eliminate the burning of all fossil fuels."
The section on trade will, as G20 communiques traditionally have done, underline the importance of free trade but say members have the right to defend themselves against uncompetitive practices.
Mrs Merkel has described the last-minute negotiations as "very difficult", with Mr Trump taking an "America first" position on trade and describing deals between countries as entrenching winners and losers.
A key meeting during the day will be between Mr Trump and Chinese President Xi Jinping, who will discuss North Korea, steel exports and America's sale of arms to Taiwan.
Mr Turnbull said he had his own discussions with President Xi, urging China to impose sanctions "thoroughly" but noting the Chinese felt their influence over North Korea was "not as great as others assert".
The leaders enjoyed a performance of Beethoven's ninth symphony at Hamburg's Elbphilharmonie concert hall on Friday night and a dinner at which Melania Trump sat next to Russian leader Vladimir Putin, who had a much-watched first meeting with Mr Trump on Friday.
Mr Turnbull will be hoping to hit some positive notes of his own in bilateral meetings with the leaders of the Netherlands and South Korea on Saturday.
The prime minister hailed as a success an agreement with Indonesian President Joko Widido to finalise an economic pact by the end of the year.
As well, the G20 members included in a statement on terrorism his call for the rule of law to be applied to tackle extremists using encrypted communications apps and social media.
Extra police are being brought in to handle what is expected to be protest rallies involving 100,000 activists, some of whom have been setting fire to cars and looting stores across Hamburg.
