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Over the past 20 years the major pollutants in our world have?

Over the past 20 years the major pollutants in our world have?
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3 votes
Over the past 20 years the major pollutants in our world have?

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User Javierfdezg
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1 Answer

3 votes

increased significantly

answered
User OBrien Evance
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7.9k points
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