Fundamental tenets of the CO2 greenhouse effect hyphothesis aren’t supported by real-world, observed evidence.
I. CO2 warms the planet by 7.2°C?
According to the IPCC and other sources, when CO2’s atmospheric concentration ranges between 0.03% and 0.04% (300-400 parts per million, or ppm), it literally warms the air by 7.2°C within the Earth’s 33°C greenhouse effect.
Problematically, at no time has it been empirically demonstrated in a real-world experiment that CO2 warms air by this temperature at this concentration. (Or any concentration.)
CO2’s capacity to warm air by 7.2°C is an non-validated assumption derived from the arbitrary estimation that CO2’s warming influence contributes about 20-25% to the Earth’s 33°C greenhouse effect.