Noting that action under the Montreal Protocol has contributed to avoiding dangerous climate change by phasing out potent ozone-depleting substances which are also greenhouse gases , Noting with concern that some alternatives to ozone-depleting substances are also significant greenhouse gases , Taking into account that the Intergovernmental Panel on Climate Change and the Technology and Economic Assessment Panel highlighted hydrochlorofluorocarbons ( HCFCs ) as potent global warming substances , Considering that the Scientific Assessment Panel has identified HCFCs as one of the best target groups to promote ozone layer recovery , The Nineteenth Meeting of the Parties decides :