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I am not at all clear what you mean, or how two bands would increase the layperson's understanding of the GHE. How about you re-work the text?
4. Effectively, infrared radiation emitted to space originates from an altitude with a temperature of, on average, –19°C, in balance with the net incoming solar radiation, whereas the Earth’s surface is kept at a much higher temperature of, on average, +14°C.
Remember, too, that IR radiation escaping through the Atmospheric Window does not contribute to the GHE, and thus doesn't belong into the definition
Increasing GHGs actually decreases IR radiation escape in the bands they interact with, by increasing the emission height. That really would lead to runaway warming if there was nothing to replace the output.
The freely escaping radiation at the surface does exactly that. Stop a watt of GHG IR and the system will store that energy untill the surface warms enough to push an extra watt of energy through the Atmospheric Window. Equilibrium is restored but the surface and atmosphere have warmed. This is not 'new' energy. It is energy that wasnt given to space.