Warmist web site Grist wisely cautioned groups of people intending to dress as The Atmosphere" for Halloween: "Do not be scientifically correct in proportioning the number of carbon equivalent costumes"

I suppose if your contingent of 2,500 people arrived at the party with only one dressed as carbon dioxide, some people might question whether atmospheric CO2 is really the most important issue in human history...

Ask Umbra on Halloween treats and costumes | Grist

[2009] The Atmosphere: Probably best as a group costume in which each member chooses an atmospheric component, with most going as carbon dioxide, methane, water vapor, etc. Do not be scientifically correct in proportioning the number of carbon equivalent costumes. When individual members of the atmosphere are questioned, say something like, “I’m methane, part of the atmosphere [point to other group members]. I’m small but influential, and I can really mess those guys up.” If the questioner looks askance or seems doubtful, start muttering about extreme weather events coming to the party soon.

PHYS103: Module 015

Because Carbon Dioxide is only 1/2500 of the Earth's atmosphere, it is the greenhouse gas that is most sensitive to human activities.