Greenhouse gases in the atmosphere hit record levels last year, continuing a "relentless rise", a new report has found.
The World Meteorological Organization's annual greenhouse gas bulletin found a 36 per cent rise in warming from 1990 to 2014, with the body warning time is running out to curb emissions.
Atmospheric levels of CO2 reached 143 per cent of the pre-industrial level in 2014, the report found.
"We have to act now to slash greenhouse gas emissions if we are to have a chance to keep the increase in temperatures to manageable levels," WMO secretary-general Michel Jarraud said.
"It's an invisible threat but a very real one."
The increases would lead to hotter global temperatures and more extreme weather events like floods, he said.
The report was released ahead of next month's United Nations climate change conference in Paris, where its hoped 196 nations will sign a global agreement to curb carbon emissions.
Australia has pledged to cut emissions by 26 to 28 per cent on 2005 levels by 2030.
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