The second biggest greenhouse gas, methane, has been growing in the past five years after levelling off between 2000 and 2006, for reasons that are not fully understood.
The third biggest greenhouse gas is nitrous oxide, which can trap almost 300 times as much heat as carbon dioxide. Its main human source is the use of nitrogen-based fertilisers, which the report said had "profoundly affected the global nitrogen cycle".
The impact of fertiliser use is so marked that more nitrous oxide is detected in the northern hemisphere, where more fertiliser is used, than in the south.
The WMO data showed no pause in the growth of greenhouse gases, and more work needs to be done to help understand which policies would have the most effect, the report's authors said.
So far, the clearest discernable impact of policies was a decrease in chlorofluorocarbons, or CFCs, which were banned because they caused depletion of the ozone layer.
But hydrofluorocarbons, which have replaced CFCs, are also potent greenhouse gases and their abundance in the atmosphere, while still small, is rising at a rapid rate. (Additional reporting by Nina Chestney; Editing by Janet Lawrence)