Scientists wrote that the pace of emissions even eclipses the onset of the biggest-known natural surge in fossil records, 56 million years ago, that was perhaps driven by a release of frozen stores of greenhouse gases beneath the seabed.
That ancient release, which drove temperatures up by an estimated 5 degrees Celsius (9 Fahrenheit) and damaged marine life by making the oceans acidic, is often seen as a parallel to the risks from the current build-up of carbon in the atmosphere from burning fossil fuels.
"Given currently available records, the present anthropogenic carbon release rate is unprecedented during the past 66 million years," the scientists wrote in the journal Nature Geoscience.
The dinosaurs went extinct about 66 million years ago, perhaps after a giant asteroid struck the Earth.
Lead author Richard Zeebe of the University of Hawaii said geological records were vague and "it's not well known if/how much carbon was released" in that cataclysm.
Current carbon emissions, mainly from burning fossil fuels, are about 10 billion tonnes a year, against 1.1 billion a year spread over 4,000 years at the onset of the fast warming 56 million years ago, the study found.
Read more at Rate of Carbon Emissions Highest in 66 Million Years, Since Dinosaur Age
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