“The physics is clear. CO2 is a greenhouse gas and will warm the planet. The coefficients and feedback loops are obscure”
So the physics is “clear” but the coefficients are “obscure”???
But hey, it’s climate “science”.
The problem is that the coefficients come from interactions that are a question of biology, chemistry, solubility, etc. We know what CO2 does to sunlight transmission (physics) and to infrared transmission (physics). We do not know quantitatively how that effect relates to temperature change, other than it should produce some temperature change and there should be (mostly negative) feedback loops that suppress that change.