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The world is frozen as the long-term result of an invention that allows the conversion of heat to electricity. Thew few survivors each live alone; there aren't as many women as men, so the main character in this story has what amounts to a time-share arrangement with a woman. When he meets her for his year with her, she has a remarkable story to tell about a visitor from space, an alien who has come to warn the inhabitants of Earth to stop using the energy convertor. The planet's libido, he says, is nearly 1. "What?" he asks. "You mean its albedo?" Yes, she replies, it might have been something like that. Where is the alien now, he asks. In the freezer, she says. A few flakes of oxygen fall from the sky.
I read this story in English in an anthology published by the 60s or 70s.