[The_Reader_David]

Oh, wonderful, yet another discrete model of a continuous non-linear dynamical system.

[expatpat]

Discrete models can in fact work well for non-linear continuous systems. That's not the real issue. The real issue is that
(a) they use climate sensitivities to CO2 which are 200-300% larger than values independently calculated from the physics,
(b) they ignore the variations in the sun's effect,
(c) they can't model clouds and cloud formation accurately, which is a big problem since clouds block most of the incoming energy from the sun during the day, and trap heat at night.