Hmmmm...
Being that C02, N20 and CH4 are trace gases and human emissions are increasing the levels of such trace radiative active, trace gases to such a high degree in a short period of time, no, this is not a farce. CH4 is a more efficient absorber per mole by about 25 times, and C02 absorbs IFR that is not absorbed by water vapor; water vapor is not in the drym upper stratosphere and more C02 accumulates there with a long atmospheric residency. C02 is a exerts a positive forcing upon H-0-H and in turn HOH is a potent positive feedback. CH4 adds to this exertion of radition absorption and thus changes the global heat budget equilibration rate.