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> Water vapor has a habit of coming down as rain.

Not sure what you mean by this. Are you saying water vapor is not a significant greenhouse gas? https://climate.nasa.gov/causes lists it as the most abundant greenhouse gas.

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It has a residence time in the atmosphere of 72 hours. Water vapor only works as a feedback. It isn't a prime mover of climate change.

The sun is the prime mover of climate change, literally everything else is feedback. If increased temperature creates increased water vapor, and increased water vapor causes increased solar radiation retention due to greenhouse effect (resulting in further temperature increases), that's a positive feedback cycle.

Water vapor is undisputed as the the #1 greenhouse gas.

The sun has been ruled out already.

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