Forty-six countries have agreed to end coal power after 250 years, but concerns have been raised about the absence of major polluters in the move.
The push at the COP26 climate conference in Glasgow comes as scientists warn that carbon emissions from fossil fuels look set to rebound to close to pre-pandemic levels this year - and could rise even further in 2022.
Initiatives announced today include a UK-led coal-to-clean power transition statement committing countries to ending all investment in new coal power generation domestically and internationally and rapidly scaling up deployment of clean power generation.
The statement also sees them commit to phasing out coal power in the 2030s for major economies and the 2040s for the rest of the world and to ensure the shift away from it is fair and benefits workers and communities.
The 46 countries who have signed up to the statement include 18 who are committing to phase out and/or not build or invest in new coal power for the first time, such as Poland, Vietnam and Chile, the UK government said.
Separately, 28 new members have signed up to the "powering past coal alliance", to phase out the use of the most polluting fossil fuel.
But the world's biggest polluter and coal user China, along with other major users and producers, the United States, India and Australia, are not part of the efforts, prompting warnings the deal has "glaring gaps".
Despite this, COP26 President Alok Sharma said it was an auspicious day, telling delegates he was confident that coal was being consigned to history.
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Asked about the absence of China and the United States on new pledges on coal, UK Business Secretary Kwasi Kwarteng said progress was being made.
Speaking to the BBC's Good Morning Scotland programme, Mr Kwarteng said: "Well, of course, they’re engaging in negotiations as well.
"The US, certainly under President Biden, is very much behind the net-zero agenda, and has got lots of pledges to reduce natural gas, to reduce methane."
He added that China has made a commitment not to invest in overseas coal mining and is looking also to phase out coal in its own electricity production.
Mr Kwarteng also pointed out that the world’s biggest polluter had committed to net zero by 2060, a huge change in just a year or so.
"It’s a shame they haven’t signed up to the pledge, but that’s something that we’re working on trying to get agreement," he said.

Efforts to swiftly end the use of coal - the single largest contributor to greenhouse gas emissions - are seen as key to cutting carbon enough to get the world on track to limit global warming to 1.5C, beyond which the worst impacts of storms, floods, droughts, wildfires and rising seas will be felt.
Since the Paris climate accord to limit global warming to 1.5C to 2C was agreed in 2015, there has been a 76% cut in the number of new coal plants planned, a cancellation of 1,000 gigawatts of new coal plants - around 10 times the UK’s total electricity generating capacity, UK officials said.
But while it appears the world’s use of coal peaked in around 2014, it is still not falling significantly, with heavy use and even increases in countries such as China.
In May, the International Energy Agency (IEA) warned that investment in new polluting coal power plants and mines, and new oil and gas projects, had to be stopped from 2021 in order to effectively tackle climate change.
In order for the planet to reach net zero emissions by 2050 - needed to meet the internationally agreed 1.5C goal - global electricity production must hit that target a decade earlier, the IEA said.
Initiatives to phase out coal also include support for emerging economies to move away from the fossil fuel, and to do so in ways that are fair to workers in coal-intensive economies.
Juan Pablo Osornio, head of Greenpeace’s delegation at Cop26, said: "For some countries signing up to this, particularly Vietnam and Egypt, the commitment to rule out new coal projects is significant given the role of coal in their economies."
But he warned the statement fell short of the ambition needed on fossil fuels in "this critical decade" for cutting emissions.
He said a plan to end coal by 2030 at the latest was needed for countries such as Poland and Germany, and a solid commitment was needed from all governments to end new coal, oil and gas projects immediately to have a chance of limiting global warming to 1.5C.
Leo Roberts, from climate think tank E3G, said: "The past few days in Glasgow have shown that momentum away from coal is gathering pace, with new partnerships, tools and money coming together to consign coal to history."
He added that the breadth and depth of announcements and initiatives announced today were an indication of how rapidly the shift away from coal is gathering pace, saying: "These announcements collectively demonstrate the era of coal is coming to an end."
The announcements come as analysis from the Global Carbon Project showed the scale of the challenge, with coal - and gas - emissions set to rise to above 2019 levels in 2021, although oil pollution remains below pre-pandemic levels.
The rapid rise could be a temporary "sugar hit" from stimulus packages that focused on industry, such as in China where emissions continued to rise during 2020, and drove an increased use of coal.
But a further rise in emissions in 2022 to new highs cannot be ruled out if road transport and aviation return to pre-pandemic levels and coal use does not drop back again after the "over-correction" of pandemic stimulus, it said.
19 countries vow to end overseas fossil fuel finance
Nineteen countries, including the US, have vowed to end direct funding for all unabated overseas fossil fuel projects by 2022.
However, major coal, oil and gas funders China, Japan and South Korea were absent from the pledge.
G20 nations last month agreed to end financial support for new unabated coal plants abroad, but today's commitment is the first of its kind to include oil and gas projects.
The British-led initiative saw countries and financial institutions agree to "end new direct public support for the international unabated fossil fuel energy sector by the end of 2022".
"Investing in unabated fossil-related energy projects increasingly entails both social and economic risks ... and has ensuing negative impacts on government revenue, local employment, taxpayers, utility ratepayers and public health," signatories said a joint statement.
Unabated fossil fuel projects are those that do not deploy technology to absorb the carbon pollution they produce.
Additional reporting Reuters & AFP