What was once a rainbow
is now no more.
The light
...
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This appears to be a post-apocalyptic vision of life (or the degradation of life) I'm familiar with from reading Science Fiction in the late 20th century. (I don't read SF much anymore.) In any case, you give plausible reasons why rainbows have disappeared; it almost sounds credibly scientific. However, the real loss is HOPE, which the rainbow symbolized. The general loss of hoe will be devastating, because hopeless people have no incentive to salvage what's left or build toward a better tomorrow; they think only of the short term, which will accelerate the decline. This is a grim poem, but the world it warns would will be much worse. Am I right about your poem?
The sun no longer shines no longer rain bow is but your poem shines on nicely sharing. Master piece.
Where people see the hope captured in a pageant spectrum of colour, you see the dissolution of that band, disintegrating back to the ether. A great thought of original thinking and beautifully written.