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21 votes
Which of the following is both a natural and manmade contributor to the greenhouse effect and warming of our planet?

A. Nuclear radiation
B. Atmospheric radiation
C. Nitrogen footprint
D. Carbon cycle

2 Answers

5 votes
The answer is D. Carbon cycle
User Yohan Liyanage
by
8.3k points
4 votes
Answer: the answer is D.



I hope it helps.
User Paul Kienitz
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8.3k points
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