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Image source, Getty Images
Image caption,Youth climate activists made a human corridor at the start of the COP26 closing plenaries on Thursday
UN chief Antonio Guterres has told the Associated Press news agency that the goal of limiting global warming to 1.5C is on "life support".
He said the COP26 summit would probably not see governments make the pledges needed to cut greenhouse gas emissions by enough.
Pressure is mounting on governments to strike a meaningful deal before the summit ends on 12 November.
But the UN chief also said hope remained "until the last moment."
Scientists say that limiting global temperature rises to 1.5C will help humanity avoid the worst climate impacts. This is compared to pre-industrial temperatures.
At Paris in 2015, world leaders pledged to try to keep the world from warming by more than between 1.5C to 2C through sweeping greenhouse gas emissions cuts. Latest projections are for a rise of 2.7C.
The UN secretary-general added that promises to reduce emissions were meaningless while governments continue to invest in fossil fuels.
"Promises ring hollow when the fossil fuels industry still receives trillions in subsidies," he said.
Meanwhile the announcements made so far in Glasgow were "far from enough".
He added: "We know what must be done."
Earlier, COP26 President Alok Sharma warned that "time is running out" to close a deal before the summit ends on Friday evening. He called on negotiators to find solutions to difficult issues.
"Whilst the window on keeping 1.5 within reach is closing, it is still possible to get there", he said.
Mr Sharma also said more work was needed on Article 6, which is about carbon markets and how countries balance their fossil fuel use.
COP26 is the biggest climate change conference since landmark talks in Paris in 2015. Some 200 countries are being asked for their plans to cut greenhouse gas emissions - which cause global warming - by 2030.
In other COP26 developments on Thursday:
- A small group of countries announced an alliance to phase out oil and gas production. Led by Denmark and Costa Rica, Beyond Oil and Gas Alliance also includes France, Wales and Ireland - but not the UK
- Activists and politicians cautiously welcomed a surprise declaration from the US and China to try to keep warming limited to 1.5C, but campaigners said both countries needed to take concrete action
- Representatives from Ghana, Ethiopia, Bangladesh and Tuvalu held a press conference claiming that the US was blocking progress at COP26. They say the US is dismissing the concerns of the poorest and most vulnerable nations over climate finance
The COP26 global climate summit in Glasgow is seen as crucial if climate change is to be brought under control. Almost 200 countries are being asked for their plans to cut emissions, and it could lead to major changes to our everyday lives.
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