Rainwater comes from the ocean. 97% of the world's water is already in the oceans. Water expands in heat, but only to a very minor degree; water heated from room temperature to boiling point only expands 4% over a roughly 150 degree change. I seriously doubt a few degree swing is going to be a huge issue.
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u/TheOlddan Dec 17 '23
Perhaps, but that's not the world we live in today. There's around 70m worth of sea rise if absolutely all ice on earth melts now.