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Over the past 20 years, the major pollutants in our world have __________.

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The choices for this question can be found elsewhere and as follows:

a. decreased significantly 
b. increased significantly 
c. stayed at the same levels 
d. decreased slightly

I believe the correct answer from the choices listed above is option B. Over the past 20 years, the major pollutants in our world have increased significantly. It is very evident when you look at the environmental statistics.
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