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By Bart Jones $19.80
By Celia Chazelle (Editor), Simon Doubleday (Editor), Felice Lifshitz (Editor), Amy G. Remensnyder (Editor)
Olibac (CC BY 2.0)
Lake sediments in a Siberian crater show that the last time atmospheric carbon dioxide was at present levels, global temperatures were 14.4 degrees hotter, forests covered the tundra and sea levels were up to 130 feet higher than they are today.
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