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Over the past 20 years, the major pollutants in our world have __________. a. decreased significantly b. increased significantly c. stayed at the same levels d. decreased slightly

Brandon Scott

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Alexa Spicer on August 19, 2018

The major pollutants in our world have increased dramatically over the past 20 years. There has been a large increase in global warming gases, such as methane and ozone. The industrialization of many parts of the world has contributed to this situation.


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