It's much easier to demonstrate AGW is a fraud using the molar mass version of the Ideal Gas Law (IGL). If you calculate the impact of doubling CO2 levels on surface air density, pressure and molar mass, you will conclude that doubling CO2 has no impact on surface temperature. Or to put it differently, if you assume some material temperature increase from doubling atmospheric CO2, then you must be able to show sufficient change in some combination of density, pressure and/or molar mass that is consistent with the IGL. But of course it cannot be done. Therefore climate sensitivity is essentially zilch and AGW is thus refuted.
It's much easier to demonstrate AGW is a fraud using the molar mass version of the Ideal Gas Law (IGL). If you calculate the impact of doubling CO2 levels on surface air density, pressure and molar mass, you will conclude that doubling CO2 has no impact on surface temperature. Or to put it differently, if you assume some material temperature increase from doubling atmospheric CO2, then you must be able to show sufficient change in some combination of density, pressure and/or molar mass that is consistent with the IGL. But of course it cannot be done. Therefore climate sensitivity is essentially zilch and AGW is thus refuted.