At this late stage of the negotiations, observers said it seems too difficult to introduce new greenhouse gases but that strong voluntary actions and domestic policy change to address black carbon emissions is essential.
Sa huli na yugto ng mga negosasyon, sinabi observers tila masyadong mahirap upang ipakilala ang mga bagong greenhouse gases ngunit na malakas na kusang-loob na pagkilos at domestic pagbabago ng patakaran sa address na black carbon emissions ay napakahalaga.