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Just finished "Timescape" by Gregory Benford. A scientist in the world of 1998, which is on the verge of ecological catastrophe, tries to stave off disaster by sending a warning back in time to 1963. Meanwhile, in 1963, another scientist tries to make sense of the extremely puzzling results he's getting in his experiments.
This is one of Benford's early novels, originally published in 1980, and it is a little rough around the edges, but still very good hard SF. Recommended.
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