Reminds me of a quote from Galactic North (2006) green marking the start of a galaxy-wide disaster (terraforming bots making the galaxy terrifically habitable).

It was impossible for stars to shine green, any more than an ingot of metal could become greenhot if it was raised to a certain temperature. Instead, something was veiling them – staining their light, like coloured glass. Whatever it was stole energy from the stellar spectra at the frequencies of chlorophyll. Stars were shining through curtains of vegetation, like lanterns in a forest. The greenfly machines were turning the Galaxy into a jungle.