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kdowney kdowney
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5 years ago
The average levels of lead in the blood of children have declined by 90%.
      
Acid deposition has increased by 27%.
      
Total emissions of five principal air pollutants have increased by 14%.
      
The release of toxic chemicals has increased by 19%.
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Educator
5 years ago
https://biology-forums.com/index.php?topic=1887786.0
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