Sure, but it makes a difference for average global temperature. The 2% water vapor matters a lot more however. Also the rise of CO2 ( 0.028% to 0.041%) is manmade, but is a net benefit.
Sure, but it makes a difference for average global temperature.
I doubt it, 4/100ths of 1% of anything isn't enough to make a layer, or a difference (unless it's Plutonium) Given its weight, any layer of CO2 would be close to the ground. Additionally, the CO2 levels have been a lot higher when the Earth was a lot colder.
The 2% water vapor matters a lot more however.
(that's more than 100%)
Not to mention the 99% O2 and Nitrogen., without it we'd freeze instantly.
I don't deny "global warming"....it happens all the time. The CO2 is dissolved in seawater, as the oceans warm up, CO2 is released.