Plans by governments to extract fossil fuels up to 2030 are incompatible with keeping global temperatures to safe levels, says the UN.
The UNEP production gap report says countries will drill or mine more than double the levels needed to keep the 1.5C threshold alive.
Oil and gas recovery is set to rise sharply with only a modest decrease in coal.
There has been little change since the first report was published in 2019.
With the COP26 climate conference just over a week away, there is already a huge focus on the carbon-cutting ambitions of the biggest emitters.
But despite the flurry of net zero emission goals and the increased pledges of many countries, some of the biggest oil, gas and coal producers have not set out plans for the rapid reductions in fossil fuels that scientists say are necessary to limit temperatures in coming years.
Earlier this year, researchers from the Intergovernmental Panel on Climate Change (IPCC) warned of the dangers for humanity of allowing temperatures to rise by more than 1.5C this century. To keep under this threshold will require cuts in carbon emissions of around 45% by 2030 based on 2010 levels.
But instead of curbing carbon, many of the biggest emitting countries are also planning to significantly increase their production of fossil fuels, according to the UN.