According to the White House website : “ the United States and China will work together and with other countries to use the expertise and institutions of the Montreal Protocol to phase down the consumption and production of hydrofluorocarbons “
Now that’s some good news are HFCs are very potent greenhouse gases. As Bloomberg noted : ” HFCs make up about 1 percent of greenhouse gases and may account for more than 20 percent by 2050. ”
As Grist notes, the European Union is also pushing into this direction. This could mean an agreement on HFCs could be reached quite soon.