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Yep. Keep planting trees.

Biden’s climate blind spot | The Hill

Another toothless useless opinion piece with nary a solution.

Has any scientist tested the greenhouse effect co2 causes

Like maybe creating a contained atmosphere like earths and testing its ability to retain heat

with various mixtures of co2

Is this just a theory on paper are have actual tests been done to prove it

This is well known, well tested, completely consistent with theory and experiment.  The IR spectrum of CO2 is of course well known and demonstrates its power as a GHG.

Without CO2 in our atmosphere, our climate would be much colder.  

whats interesting to me is that co2 only makes up .04% of our atmosphere and man made co2 is only a little less the 4% of that number

As has been explained several times, this 4% figure is simply false.  It's not remotely close to being true.  It is not even debateable.

I think you probably would need to do some more reading about the greenhouse effect to appreciate how 0.04% can make a large difference in heat emission and temperature.  I could post the IR spectrum, but it wouldn't mean anything unless you understand IR spectra.

so if our total atmosphere was 10,000 units of volume

Total co2 would be 40 units

Total man made co2 would be 1.6 units

It is just amazing that such a small number of units would be causing global warming

Being amazing doesn't make it wrong.

Methane is currently about 1.8 ppm in the atmosphere, which seems paltry compared to the 400+ ppm of CO2. Obviously CO2 is therefore over 200x the concentration in the atmosphere of methane.

But atmospheric methane has about 80x the warming power of CO2, so it is estimated to be responsible for a full 25% or more of the observed climate warming.

I agree but that why Im asking has anyone ever dont experiments creating a copy of earths atmosphere and looking at its heat retention

and varying the mixture to see the results or is it simply assumed

I agree but that why Im asking has anyone ever dont experiments creating a copy of earths atmosphere and looking at its heat retention

and varying the mixture to see the results or is it simply assumed

Yes. MANY experiments have been done. The relationship between CO2 and also methane as greenhouse gases is WELL understood. 

In fact, it's so well known and understood that it's an experiment you can do to show school children. https://www.steampoweredfamily.com/the-greenhouse-effect-experiment/