This conference paper gives a detailed overview of the international online-event ‚Green Cooling Summit‘ which took place from 25. to 27. May 2021. The central issue was the HFC phase down according to the Kigali Amendment to the Montreal Protocol and how it can be implemented with natural refrigerants. Talks adressing this issue were given by representatives of parties to the Montreal protocol as well as by industry and research representatives. In addition to the description of talk and discussion contents, key messages are highlighted in the text and summarized in a compact manner ahead of the description. Recordings of the talks are linked in the respective texts, so they can be followed entirely in retrospect. Further conference material is available under the given link.