Dry air contains roughly (by volume) 78.09% nitrogen, 20.95% oxygen
Dry air contains roughly (by volume) 78.09% nitrogen, 20.95% oxygen , a variable amount of water vapor, on average around 1%, 0.93% argon, 0.039% carbon dioxide. And you want me to believe that something that is less than .04% of the atmosphere is going to have a significant effect? Don't forget that water vapor is the largest greenhouse gas and there is more than 25 times as much of that as CO2. Don't buy into the global warming hoax.