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Australian Prime Minister Scott Morrison has addressed a global climate summit without committing the country to more ambitious emissions targets.

Mr Morrison's appearance followed the US's headline pledge to reduce 2005 emissions by up to 52 per cent by 2030 and President Joe Biden's call for other countries to act more strongly.

The Prime Minister's speech also came after Canada increased its commitment to a 40 to 50 per cent cut from 2005 emissions by 2030, Brazil's pledge of climate neutrality by 2050, and others.

READ MORE: US president opens with ambitious new climate pledge

Australia's current target is to cut emissions by 26 to 28 per cent below 2005 levels by 2030, a goal reportedly described as "insufficient" by the Biden administration on Thursday.

In a short speech, the start of which was impacted by audio issues, Mr Morrison said Australia would "update our long term emissions reduction strategy" later in the year. But he again avoided putting a timeframe on the nation's "pathway to net-zero" or pledge deeper emissions cuts by 2030.

"Our goal is to get there as soon as we possibly can, through technology that enables and transforms our industries, not taxes that eliminate them, and the jobs and livelihoods they support and create, especially in our regions," he said, speaking close to midnight AEST.

"For Australia, it is not a question of if, or even by when for net-zero, but importantly how."

Mr Morrison insisted Australia was on its way to meeting its Paris commitments, plugged the nation's world-leading rooftop solar uptake, and pushed a technology- and industry-led approach to combating climate change.

He specifically name-checked major mining companies and billionaire Andrew Forrest.

"In Australia, our journey to net-zero is being led by world-class pioneering Australian companies like Fortescue, led by Dr Andrew Forrest, Visy, BHP, Rio Tinto, AGL and so many more of all sizes," he said.

"It has also been pioneered by agricultural and marine sectors through soil science and sustainable fisheries. "

READ MORE: Australia pledges tech investment ahead of Biden's climate summit

Mr Morrison spoke of wanting to produce the "cheapest clean hydrogen in the world" for $2/kg before directly addressing Mr Biden to compare Silicon Valley with Australia's planned "hydrogen valleys".

The UN Secretary-General had earlier called for a price on carbon, an end to subsidies for fossil fuel, and the phasing out of coal by 2030 in the wealthiest countries and 2040 everywhere else.

Mr Biden said the US couldn't act alone and called for all countries to act at "a moment of peril but a moment of opportunity."

"No nation can solve this crisis on our own, as I know you all fully understand," he said.

"All of us, all of us and particularly those of us who represent the world's largest economies, we have to step up."

Nine newspapers reported that senior Biden administration officials said Australia could not rely solely on technology to get to net zero emissions by 2050.

"At the moment I think our colleagues in Australia recognise there is going to have to be a shift," the senior official, speaking on condition of anonymity, reportedly said during a briefing call.

"It's insufficient to follow the existing trajectory and hope that they will be on a course to deep decarbonisation and getting to net zero emissions by mid-century."

Earlier this week, Mr Morrison pledged more than $1 billion towards hubs for carbon capture and hydrogen technologies and a plan to drive foreign investment in Australian climate tech projects.

"You can always be sure that the commitments Australia makes to reduce greenhouse gas emissions are bankable," he said.

"We have proven performance, transparent emissions accounting and transformative technology targets to unlock pathways to net zero. 

"Future generations, my colleagues and excellencies, will thank us not for what we have promised, but what we deliver. 

"And on that score, Australia can always be relied upon."

United States President Joe Biden has called on other major polluters to "step up" on emissions reduction at a climate summit that heard wealthy nations must phase out coal by 2030.

In a move likely to increase pressure on Australian Prime Minister Scott Morrison to increase Australia's climate change ambitions, Mr Biden pledged the US would cut emissions at least in half from 2005 levels by 2030.

The commitment drew praise from United Nations Secretary-General António Guterres for "walking the talk" and from UK Prime Minister Boris Johnson for the "game-changing announcement".

READ MORE: Why Greta Thunberg's decision to wag school was a 'strike of genius'

Mr Biden said the steps put the US on the road to achieving net-zero emissions by 2050 but stressed his country represented less than 50 per cent of global emission.

"No nation can solve this crisis on our own, as I know you all fully understand," he said.

"All of us, all of us and particularly those of us who represent the world's largest economies, we have to step up."

Mr Biden declared to the 40 world leaders that "meeting this moment is about more than preserving our planet". "It's about providing a better future for all of us," he said, calling it "a moment of peril but a moment of opportunity".

"The countries that take decisive action now to create the industries of the future will be the ones that reap the economic benefits of the clean energy boom that's coming," he said.

Mr Guterres wants a global coalition on net-zero emissions by 2050, calling for all countries to submit new and more ambitious mitigation efforts.

The UN Secretary-General called for a price on carbon, an end to subsidies for fossil fuel, and the phasing out of coal by 2030 in the wealthiest countries and 2040 everywhere else.

"We need a green planet but the world is on red alert," he said.

"We are at the verge of the abyss. We must make sure the next step is in the right direction. Leaders everywhere must take action."

Mr Morrison is attending the virtual summit with dozens of other world leaders but has so far resisted pressure to increase Australia's mid-term emissions target.

Mr Morrison, while avoiding setting any ambitious new targets, has also pushed new technology such as hydrogen and carbon capture as key to Australia's plan to address climate change.

He has pledged more than $1 billion this week towards hubs for those two technologies and a plan to drive foreign investment in Australian climate tech projects.

Canada ups pledge, China stands firm

Canadian Prime Minister Justin Trudeau also upped his country's emissions reduction ambitions, pledging a 40 to 50 per cent cut from 2005 emissions by 2030.

Japan, a heavy user of coal, announced its own new 46 per cent emissions reduction target Thursday as the US and its allies sought to build momentum through the summit.

Korea also pledged to further raise its emissions reduction target and end all public financing for overseas coal-fired power plants. 

Chinese President Xi Jinping, whose country is the world's biggest emissions culprit, followed by the United States, did not make any new commitments, instead reaffirming China's goal to reach "peak" CO2 emissions by 2030 and carbon neutrality before 2060.

"Developed countries need to increase climate ambition and action and make concrete efforts to help developing countries accelerate the transition to green and low carbon development," he said.

India, the world's third-biggest emitter of fossil fuel fumes, has been pressing the United States and other wealthier nations to come through on billions of dollars they've promised to help poorer nations build alternatives to coal plants and energy-sucking power grids.

German Chancellor Angela Merkel praised the US commitment and stressed the need for solidarity with developing countries.

With the pledge from the US and other emissions-cutting announcements, half the world's economy had committed to cutting fossil fuel fumes enough to keep the earth's climate from warming, disastrously, more than 1.5 degrees Celsius, the Biden administration said.

Mr Biden, a Democrat, campaigned partly on a pledge to confront climate change.

He has sketched out some elements of his $2 trillion approach for transforming US transportation systems and electrical grids in his campaign climate plan and in his infrastructure proposals for Congress.

The coronavirus pandemic compelled the summit to play out as a climate telethon-style livestream, limiting opportunities for spontaneous interaction and negotiation. The opening was rife with small technological glitches, including echoes and random beeps and voices.

– with Associated Press