Now that the battle regarding ozone depleting potential (ODP) refrigerants has ended with the phaseout of CFCs and HCFCs, the fighting has shifted to issues related to the global warming potential (GWP) of the remaining and newly developing refrigerants.

The field of combat not only includes f-gases such as HFCs and HFOs, but also so-called natural refrigerants such as propane, carbon dioxide, and ammonia.