Atmospheric carbon dioxide (CO2) emissions rose by about three percent last year, according to a new study.
Last year, all the world's nations combined pumped nearly 38.2 billion tonnes of carbon dioxide into the air from the burning of fossil fuels such as coal and oil, according to new international calculations on global emissions published on Sunday in the journal Nature Climate Change.
Scientists say it will be unlikely for the world to limit temperature increases to 2 degrees Celsius (3.6 degrees Fahrenheit).
Three years ago, nearly 200 nations set the 2-degree Celsius temperature goal in a non-binding agreement. Negotiators now at a conference under way in Doha, Qatar, are trying to find ways to reach that target.
Andrew Weaver, a climate scientist at the University of Victoria in Canada who was not part of the study, said: "We are losing control of our ability to get a handle on the global warming problem."
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