And what are the differences in atmospheric composition in your small, "closed system" test? Carbon dioxide is, in our "polluted" atmosphere, still a trace gas along with neon, helium, methane, krypton, hydrogen, nitrous oxide, xenon, ozone, iodine, carbon monoxide, ammonia, etc. All those trace gasses together making up about 1%, carbon dioxide being, therefore, well less than 1%. Your hot and sweaty beaker filled with Carbon dioxide, which would likely no longer be breathable, should very well be hotter from added capacity for heat absorption, but bears absolutely no resemblance to the reality of the Earth's atmosphere whatsoever.
I never said it did.
I agree with your assessment of primary school science teaching. Not sure of the relevance here though.Primary school science teachers should have a bit more ability for critical thinking than their pupils, whilst attempting to instill the same through their lesson planning, don't you think?