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PAUL CRUTZEN. Philatelic Envelope signed: "Paul Crutzen", 6½x3½. First Day Cover promoting energy conservation, postmarked Detroit, Michigan, September 23, 1974, 10-cent stamp affixed, FIRST DAY OF ISSUE. Dutch scientist Crutzen (b. 1933) studies atmospheric effect on climate at the Max Planck Institute for Chemistry, Mainz, Germany. He received a Nobel Prize in Chemistry (1995), along with Mario Molina and F. Sherwood Rowland "for their work in atmospheric chemistry particularly concerning the formation and decomposition of ozone." Because ozone absorbs a high percentage of the sun's ultraviolet light, understanding and preserving its protective layer is vital to life on Earth. Fine condition.

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Born: December 9, 1933

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