To learn about how polar ice sheets melted during an ancient era, scientists examined fossil coral reefs in the tropics.

By Bob Berwyn

A new set of detailed clues gleaned from ancient fossil reefs on the Seychelle Islands shows an increasing likelihood that human-caused warming will raise the global average sea level at least 3 feet by 2100, at the high end of the projections by the Intergovernmental Panel on Climate Change.

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