The discussion focuses on the absorption effects of green glass as an absorption filter. It is established that green glass absorbs light outside the green wavelength spectrum, preventing those wavelengths from passing through. This selective filtering results in the heating of the glass due to the absorbed light. The glass does not convert light into other colors; it merely filters specific wavelengths, allowing only green light to pass through.
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Drakkith said:The green glass functions as an absorption filter, absorbing much of the light that doesn't fall within a specific range of wavelengths. In this case, the glass will absorb a significant amount of the light that falls outside of the area of the spectrum we call green. The absorbed light ends up heating the glass.
Note that the glass isn't converting the light into another color, it is simply filtering out certain ranges of wavelengths (and thus colors) so that they do not pass through, allowing only the range of wavelengths you want to pass through.