Answered

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

Adecreased significantly
Bincreased significantly
Cstayed at the same levels
Ddecreased slightly

Verified Answer :

herooftime3000

The most likely answer is B, increased significantly. This is so, because of the vast amount of cars, and factories, still in use.So, based upon the statistics and the levels of pollution all over the world, I would have to answer B. 

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