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- THE WEEK, Page 26HEALTH & SCIENCEGet Out the Lifeboats! Antarctica Is Melting
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- New evidence suggests the ice caps are more fragile than
- assumed
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- If the Earth gets warmer, will the ice caps melt? That's a
- matter of hot debate among scientists who worry about possible
- climatic change. The Antarctic ice sheet alone is larger than
- the continental U.S. and holds a mass of water that if melted
- would raise world sea levels by about 60 m (200 ft.).
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- Coastal residents could take comfort in the prevailing
- view that Antarctica hasn't thawed for 14 million years, but
- that view is being challenged. A report in Nature suggests
- large portions of the ice cap may have melted just 3 million
- years ago.
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- The evidence centers on sea-plankton remains found in the
- Transantarctic Mountains at altitudes where no sea should have
- been. By measuring the age of nearby volcanic ash, a team led
- by Peter Barrett at Victoria University of Wellington, New
- Zealand, concluded that the whole area was probably flooded
- during the mid-Pliocene epoch -- when temperatures were only a
- few degrees warmer than today.
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