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  1. Earth

    UV-pollutant combo hits tadpoles hard

    Coincident exposure to ultraviolet light and an estrogen-mimicking pollutant severely jeopardized the chance a tadpole would reach adulthood.

    By Janet Raloff
  2. Earth

    Sewage linked to fish-gender quirks

    Releases from sewage treatment plants appear to impair reproductive tissues in fish.

    By Janet Raloff
  3. Earth

    Pollutants shape baby-gator gonads

    The same pollutants that appear to shorten the length of a grown-alligator's phallus actually lead to this organ's lengthening in baby gators.

    By Janet Raloff
  4. Earth

    POPs treaty enacted

    A new United Nations treaty that seeks to phase down or eliminate production and use of 16 persistent, toxic pollutants has gone into effect.