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What do you believe the definition of GHGs is?
I can find nothing on the Internet about Graeff 's world changing experiments.
First, I don't operate on belief like you.
Greenhouse gasses are any of the compounds in the atmosphere that absorb IR and hypothetically trap heat via various hypothetical mechanisms and contribute to the hypothetical greenhouse effect.
I'll get you a link to gareff's experiments which aren't world changing at all. They merely confirm that the ideal gas laws can explain the temperature here without the need for magical gasses.
It's a simple experiment to measure the portion of the EM spectrum absorbed by different compounds. In fact, QM tells is what the answer will be before the experiment.
It's simple to compare the absorbed spectrum with the wavelength distribution of average outgoing reflections from Earth. Gaseous compounds that match are called GHGs.
It's simple to estimate the relationship between GHG atmospheric concentration and the probability of collision between outgoing photons and GHG molecules.
It's a QM given that when those molecules are elevated to a higher energy state than their neighbors, they will emit energy to return to a stable state, and that energy can be treated as radiating in all directions. Roughly half up, and half down.
The half going down will return to warm the earth, nanoseconds after their departure cooled the earth.
The net effect is that, instead of all of earth's reflections leaving the system, only half do.
Same in, reduced out in proportion to GHG atmospheric concentrations, nets more energy to be absorbed by land, water, ice, atmosphere.
The only possible reaction to that is warming, until the energy out is increased, until balance between in and out is restored.
This is not rocket science.
But, long term, accurate predictions of the weather reactions of achieving rebalance are beyond present science. But they can use both short and long term history under similar conditions to make approximations.