I went ahead and read Earth at Peace for some context. There's not the same level of detail here as there, but it allows space for more ambiguity in the wording, which I always enjoy. My one suggestion was for this part to have a touch more specificity:
From motionless leaftips and seedheads...
This occurred to me because I read "motionless seedheads" and found myself imagining dandelions on the cusp of their seeds being whisked away. But it doesn't actually say that, which felt like a missed opportunity. To match it, for leaftip I refreshed my tree symbolism knowledge before at last setting on an olive tree. It had those religious/divine undertones that fit with the overall atmosphere of cataclysm--and a sense of peace in the face of that cataclysm.
The poem (vignette?) generates an atmosphere of 'before' and 'after' with the moment in-between cut out. The liminal space has been lost. To quote Richard Rohr:
The very vulnerability and openness of liminal space allows room for something genuinely new to happen. We are empty and receptive—erased tablets waiting for new words. Liminal space is where we are most teachable, often because we are most humbled. Liminality keeps us in an ongoing state of shadowboxing instead of ego-confirmation, struggling with the hidden side of things, and calling so-called normalcy into creative question.
But the time for change has past, and the end has come. It's very somber. The one exception is the line about clouds, which utilizes a cotton candy simile. The denotation of 'dissolve' is inherently that of flux. We also get rainbow imagery here, which commonly symbolizes hope and rebirth. It made me think that if there was any hope, it would be found in children.
Normally I'd share a poem here, but instead I'll go with a quote from teenage-me's favorite author:
“It's true, I am afraid of dying. I am afraid of the world moving forward without me, of my absence going unnoticed, or worse, being some natural force propelling life on. Is it selfish? Am I such a bad person for dreaming of a world that ends when I do? I don't mean the world ending with respect to me, but every set of eyes closing with mine.” --Jonathan Safran Foer, Everything is Illuminated