Many scientists believe that the current period of global warming is related to increased levels of ___ . A. nitrogen in the Earth's atmosphere. B. radon being released from the Earth's soil. C. carbon dioxide in the Earth's atmosphere. D. hydrogen in the outermost layer of the Earth's atmosphere.
(2) Answers
They believe global warming is caused by an increase in levels of carbon dioxide.
C. carbon dioxide in the Earth's atmosphere
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