摘要
Hydrofluoroolefins （HFOs）： New-generation refrigerants and foaming agents Hydrofluorocarbons （HFCs）, which represent the third genera- tion of refrigerants and foaming agents, do not contribute to ozone depletion; that is, their ozone-depleting potential （ODP） is zero. However, HFCs are listed as greenhouse gases by the Kyoto Protocol because of their relatively high global-warming potential （GWP）.
