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--asks K. Curtin, from Long Island, NY.
Scientists study a color-changing volcanic lake.
Engineers attempt to protect eroding beaches.
A beach may replace the sanitation department in Manhattan's meatpacking district.
Conservation through architecture.
George Thurston battles asthma in the Bronx.
--asks Alison W. from Albany, NY
Little-known fish are vanishing from the depths.
A day in the life of Roger D. Flood, marine geologist.