With the world far off track on its 2015 pledge to curb global warming, a new United Nations report central to upcoming climate negotiations details how quickly and deeply energy and financial systems must change to get back on a safer path.

“The window of opportunity to secure a livable and sustainable future for all is rapidly closing,” Friday’s report warned.

The globe has to cut its emissions of heat-trapping gases by 43 per cent by 2030, compared to 2019 levels, and 60 per cent by 2035, the report said. To get there, the report said, “the phase-out of unabated fossil fuels is required,” using a phrase international climate negotiators have shied away from before. It also said phasing out the internal combustion engine would be a huge help.

And the way money flows — such as investments, subsidies, loans, grants and payments for people and places hurt by warming’s extreme weather — also has to change, the report recommended. It said countries need to stop US$450 billion in annual subsidies for coal, oil and natural gas.

“Halting and reversing deforestation” and adopting better crop-growing practices are critical to fighting climate change, the report said. It noted that about 95 per cent of deforestation is in the tropics, but global consumers drive the tree loss.

“We must urgently disrupt business as usual and unite like never before to move from ambition to action and from rhetoric to real results,” upcoming international climate negotiations president Sultan Al Jaber said in a statement.

The first of its kind report, called the “global stocktake” on climate-fighting efforts, put such an emphasis on change that it used variations of the word “transform” more than 50 times in 47 pages.

“The report really puts a spotlight on that kind of transformation of systems that needs to take place,” said David Waskow, international climate initiative director at the World Resources Institute. “We’re past the point of incremental type of change if we’re going to take seriously what needs to be done.”

Former US Vice-President Al Gore said on social media, “This latest report shows that we are failing, not because we don’t know the answers — but because we aren’t doing our homework.”

This comes as leaders of the top 20 economies, responsible for 80 per cent of the world’s greenhouse gas emissions, meet in India. United Nations Secretary-General Antonio Guterres told them to act quickly on warming because “the climate crisis is worsening dramatically.”

In 2015, as part of the landmark Paris Agreement, the countries of the world agreed to try to limit warming to 1.5 degrees Celsius (2.7 degrees Fahrenheit) or at least 2 degrees Celsius (3.6 degrees Fahrenheit) since pre-industrial times. It’s already warmed about 1.1 degrees (2 degrees Fahrenheit) since the mid-1800s.

Limiting warming to 1.5 degrees is another window of opportunity that is rapidly closing, the report said. Earlier this year, the World Meteorological Organization said there’s a two-out-of-three chance that in the next five years, Earth will exceed that threshold for a year.

The report “feels like a final warning,” said Climate Analytics CEO Bill Hare, a climate scientist. “‘If you guys don’t get your act together, we’re going to cook.'”

The world just baked through the hottest summer ever recorded, and ocean temperatures keep smashing records.

The way the Paris agreement works is that every country makes its own carbon pollution pledges and efforts — and every five years they are supposed to ratchet them up. Key is that between those five years, climate negotiators come up with what’s like a midterm grade for the world’s efforts and a roadmap for preventing more dangerous warming.

That’s the “global stocktake” released Friday. After three years of work by scientists, government officials and others, the United Nations’ climate agency came up with a technical report that is supposed to lead to something bigger this December when world leaders and climate negotiators convene in Dubai.