Selwin Hart, the UN's assistant secretary-general and special adviser on climate action, told the ANU's Crawford Leadership Forum the phasing out of coal is a prerequisite of limiting global warming to 1.5C.

"If the world does not rapidly phase out coal, climate change will wreak havoc right across the Australian economy: from agriculture to tourism, and right across the services sector," he said.

But he said coal workers and their communities were entitled to a "just transition" to new jobs.

Resources Minister Keith Pitt said coal would remain a significant contributor to the Australian economy well beyond 2030.

"The future of this crucial industry will be decided by the Australian government, not a foreign body that wants to shut it down costing thousands of jobs and billions of export dollars for our economy," Mr Pitt said on Monday.

He noted in the three months to July, coal exports soared to $12.5 billion - a 26 per cent increase on the previous quarter.

But while it was Australia's second largest export, the nation accounted for six per cent of the world's total annual production behind China, India and Indonesia.

"Coal will continue to generate billions of dollars in royalties and taxes for state and federal governments, and directly employ over 50,000 Australians."

Labor leader Anthony Albanese said the market was leading the energy industry away from coal-fired power toward cheaper renewables.

"This is an opportunity for Australia," he said.

Mr Hart said the region was looking to Australia for leadership, especially on the target of net zero emissions by 2050.

Prime Minister Scott Morrison has said it is the government's "preference" to get to net zero by mid-century, but has not formally committed to it.

"National governments responsible for 73 per cent of global emissions have now committed to net zero by mid-century, and we urge Australia to join them as a matter of urgency," Mr Hart said.

All countries have been encouraged by the UN to submit enhanced "nationally determined contributions" - or NDCs - before COP26 climate summit in Glasgow in November.

Mr Albanese said he was committed to net zero emissions by 2050 as it was "good for jobs, good for lowering prices, as well as being good for lowering emissions and good for the environment".

A spokewoman for Emissions Reduction Minister Angus Taylor said Australia had a strong 2030 target and a clear plan to meet and beat it.

British high commissioner Victoria Treadell said a higher level of ambition for the 2030 and 2050 targets was needed from all countries.

"We are very much hoping we will see that new level of ambition and I know it is something your prime minister is looking at, working hard to try to find a position in time for Glasgow," she told Sky News.

Australian Associated Press