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3 years ago

8

Which substance is of great concern to scientists studying human-generated greenhouse gases, and is thought to increase such tha

t the earth's climate will be irrevocably changed by 2020?
A) chlorofluorocarbons

B) carbon dioxide

C) methane

D) nitrous oxide

E) ozone

1 answer:

Neporo4naja [7]3 years ago

8 0

Answer:

C

Explanation:

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