The conversation between human and AI assistant.
[|Human|] What are the most abundant greenhouse gases in Earth's atmosphere
[|AI|] The most abundant greenhouse gases in Earth's atmosphere, listed in decreasing order:

Water vapor
Carbon dioxide
Methane
Nitrous oxide
Ozone
Chlorofluorocarbons
Hydrofluorocarbons
Perfluorocarbons
[|Human|] 
What are the most abundant greenhouse gases in Earth's atmosphere