What simple experiment could I perform that would demonstrate the carbon dioxide is a greenhouse gas?

I would say that evidence showing co2 levels having an 800 lag behind temperatures endorses this theory, ie co2 rises after temp changes in order to cool the world . Yup, it sure is a complicated planet and it seems only extraordinary intellects can claim to know it all, thank god for good old consensus.

Further evidence that climate change deniers are crack-pots. CO2's reaction to incoming sunlight in the thermosphere (50 miles up) has nothing to do with it's reaction to infrared in the troposphere. To deny the greenhouse effect is to deny that life exists on this planet.

And to claim that Al Gore was alive in the 1860s is at least insane enough to be funny. Flat out loonie-tunes these people are.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.