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Monthly Archives: March 2000

Focus on ozone


Looking to plug holes in our knowledge about the ozone hole, some 350 scientists from around the world are studying the Arctic atmosphere this winter to understand chemical changes in the stratosphere (30,000 to 180,000 feet up) brought about by solar radiation.

Bacterium cleans up sewage


There are about 5 billion people on the planet now, and human waste has taken its toll on the environment. But ammonia, one of the most common noxious waste products, has a new enemy.