The Climate Action Network Europe (CAN Europe) study of hydrofluorocarbon emissions, reported in News (Nature 419, 656; 200210.1038/419656b), contained an error. The emission of these gases is predicted by CAN Europe to be much lower than the number given in its report at the time Nature's article was written. The report has now been corrected; see http://www.climnet.org/pubs/ozoneclimate.htm for the correct version and further details of the calculation.