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...right, that's not what the "black-body spectrum" refers to. All macroscopic objects at finite temperature emit radiation with a temperature-dependent spectrum that we call "black body radiation". The human body, coffee mugs, hot steel rods, etc. are all very far from black in color, yet the radiation they emit is all extremely well predicted by the black body spectrum.
In fact, the greenhouse effect is basically just saying that a blacker earth would be hotter, and a more reflective earth would be cooler. If the earth is very reflective, only a small portion of the sun's rays will be absorbed, so the earth's surface will radiate heat until it gets to a temperature where the absorbed energy is equal to the black-body emitted energy. Same thing in reverse if the earth starts absorbing a greater fraction of the sun's energy.
Please study more high school physics before proclaiming you've found a glaring error in a century-old physics phenomenon.
Climate change might not be happening, and even if it is happening it might very well basically be a nothingburger for human civilisation... but these have nothing to do with the rock-solid fundamental physics of the greenhouse effect.
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