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Answer:

Across
5the presence in or introduction into the environment of a _____ or thing that has harmful or poisonous effects
Down
1make (something) suitable for a new use or purpose
2a gradual increase in the overall temperature of the earth's atmosphere generally attributed to the _____ effect caused by increased levels of carbon dioxide, chlorofluorocarbons, and other pollutants
3Depend is to be controlled or determined by or rely on
4Natural _____
 
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