In article ,
Gordon wrote:

If you have to wear an oxygen mask at high altitudes because oxygen
(32) is heavier than other gases that make up our air (28), then how
does co2 get into the stratosphere and cause a warming blanket when co2
(44) is much heavier than oxygen?
Gordon

Obviously, you have never heard of airplanes that fly above 25K Feet.....
and significant Updraftings like Torandos, Cyclones, ect.....