An incontrovertible fact is the existence of atmospheric downwelling infrared radiation that is interpreted to come from CO2. Much intellectual gymnastics are used to use this fact as a feature of the Greenhouse Effect of our atmosphere. It is based on the belief that infrared radiation that is absorbed by CO2 is remitted as downwelling infrared radiation causing warming.
The observed atmospheric downwelling infrared radiation is caused by the flow of electric currents through the atmosphere. (The atmosphere is defined as the physical object between the Earth’s surface and the base of the Ionosphere). That IR radiation does not come from CO2.
In other words there is no greenhouse effect since molecules of gas are not thermal batteries. The image was copied from an excellent presentation by Ben Davidson at the 2019 Observing The Frontiers Conference in Albuquerque, New Mexico.
And the fatal flaw in climate science? By restricting the energy input to the Earth as the total solar irradiation, TSI, and assigning the rest of the electromagnetic spectrum to the human contribution to climate change.