Switching just some of the huge subsidies supporting fossil fuels to renewables would unleash a runaway clean energy revolution, according to a new report, significantly cutting the carbon emissions that are driving the climate crisis.

Coal, oil and gas get more than $370bn (£305bn) a year in support, compared with $100bn for renewables, the International Institute for Sustainable Development (IISD) report found. Just 10-30% of the fossil fuel subsidies would pay for a global transition to clean energy, the IISD said.

Ending fossil fuel subsidies has long been seen as vital to tackling the climate emergency, with the G20 nations pledging in 2009 to phase them out, but progress has been limited. In May, the UN secretary general, António Guterres, attacked subsidies, saying: “What we are doing is using taxpayers’ money – which means our money – to boost hurricanes, to spread droughts, to melt glaciers, to bleach corals. In one word: to destroy the world.”

The new analysis shows how redirecting some of the fossil fuel subsidies could decisively tip the balance in favour of green energy, making it the cheapest electricity available and instigating a rapid global rollout.

“Almost everywhere, renewables are so close to being competitive that [a 10-30% subsidy swap] tips the balance, and turns them from a technology that is slowly growing to one that is instantly the most viable and can replace really large amounts of generation,” said Richard Bridle of the IISD. “It goes from being marginal to an absolute no-brainer.”

The transition from polluting fossil fuels to clean energy is already under way. Annual investment in renewables has been greater than that in fossil fuel electricity generation since 2008 and new renewable capacity has exceeded fossil fuel power each year since 2014.

But progress is slow compared with the urgency required, said Bridle. “There is no question that renewables can power the energy system,” he said. “The question now is can we transition quickly enough away from fuels like coal, and subsidy reform is a very obvious step towards that.” Very few ways of cutting emissions actually save governments money, he said.

“Taking away subsidies from fossil fuels and channelling them towards clean energy would boost their development at a much faster pace, and help secure our climate goals,” said Ipek Gençsü of the Overseas Development Institute. An added bonus is the social and economic benefits, such as reduced air pollution and health spending, she said.

“A key breakthrough [in the energy transition] could occur if countries cut their fossil fuel subsidies, which are propping up dirty energy,” said Rana Adib, the executive secretary of the global sustainable energy network REN21. A recent REN21 report found 112 nations subsidised fossil fuel prices.

Reform of fossil fuel subsidies could have a significant impact on global heating. An earlier IISD study of 20 countries with large fossil fuel subsidies found that a 30% swap to renewables would lead to emissions reductions of between 11% and 18%.

Most experts define fossil fuel subsidies as financial or tax support for those buying fuel or the companies producing it. The IMF also includes the cost of the damage fossil fuel burning causes to climate and health, leading to an estimate of $5.2tn of fossil fuel subsidies in 2017, or $10m a minute. Ending the subsidies would cut global emissions by about a quarter, the IMF estimates, and halve the number of early deaths from fossil fuel air pollution.

Bridle said funding fossil fuel subsidies was “madness”, but said ending them could cause short-term price rises and political difficulties, as the benefits of lower costs in the future and reduced air pollution are less obvious.

“There are political problems but it is worth persevering because the prize is so big,” he said. “You have to bring people along with you.” Gençsü said governments must ensure that the most vulnerable people were not adversely affected by changes.

Fossil fuel subsidies are most prominent in oil-producing nations such as Saudi Arabia, which subsidises petrol, and some coal-using countries such as Indonesia, which caps the cost of the fuel at 75% of the market rate. Some nations are making progress, with India cutting petrol subsidies by about 75% since 2014, according to the IISD.