The Chronicle of Higher Education
THE NATURAL WORLD

An Unsettled Forecast for Global Warming

By MALCOLM G. SCULLY

Climate science, Doug Macdougall writes, "is notoriously difficult, because there are so many interconnected variables at work that cause and effect are often impossible to discern with confidence."

Those variables, which Macdougall discusses in Frozen Earth: The Once and Future Story of Ice Ages, published recently by the...

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