[[Solar energy is mostly in the UV spectrum, which is not absorbed by CO2. Radiant energy form the Earth is in the IR spectrum, which is absorbed by CO2]]
Ok that explains one of the questions I had about CO2 reflecting the sun’s energy or not- But even if it isn’t absorbed, can it be reflected by CO2?
The more complex answer is that for a given wavelength of light (λ), a material can absorb (αλ), reflect(ρλ), and/or transmit(τλ) a fraction of the energy in the wavelength, and the sum of αλ+ρλ+τλ = 1.