[palmer]

There is virtually no CO2 in the atmosphere.

It's the second strongest greenhouse gas. Ozone is the third strongest. All the rest are also-rans. The water vapor that does the bulk of the warming would not be possible without CO2. Take away CO2 and the air gets cold and dry and oceans freeze from pole to pole.

[ROCKLOBSTER]

I said there is virtually none in the atmosphere.

So how much is there, as a percentage?

[dirtbiker]

It's the second strongest greenhouse gas. Ozone is the third strongest. All the rest are also-rans. The water vapor that does the bulk of the warming would not be possible without CO2.

Ozone is NOT third, it is fourth.

The "greenhouse gases" are (in order and strength):
Water vapor 35-70%,
CO2 9-26% (I guess that depends on whether Algore is speaking that day),
Methane 4-9% (Depends on whether Big Al had a double chili burrito before speaking),
ozone 3-7% (Upper level ozone is produced by the sun)....