However, if they were to search online-> ‘demonstration proof greenhouse effect is real’, then they would see for themselves that the greenhouse effect is demonstrable and that, indeed, carbon dioxide is a “greenhouse gas”. Hence, the impact that carbon dioxide has upon the greenhouse effect.
Greenhouse Gas Demo (4 minute):
https://youtu.be/kwtt51gvaJQ
Greenhouse in a Beaker:
Greenhouse Gases Explained (2 min.):
https://youtu.be/oxke_f5iWCI
Greenhouse Effect Explained (5 min):
https://youtu.be/z1MIV4NKp3g
Has Greenhouse Effect Been Falsified:
https://www.skepticalscience.com/does-greenhouse-effect-exist.htm
Note: The above experiments do not show the ratio of warming per unit of CO2. Such finesse in a jar is not possible. The intent is only to demonstrate that CO2 absorbs warmth:
https://scied.ucar.edu/carbon-dioxide-absorbs-and-re-emits-infrared-radiation