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In studies scientists have found that the level of carbon dioxide has increased. What is an explanation for this? A. volcanoes erupting B. humans use of fossil fuels C. climate change D. photosynthesis
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In studies scientists have found that the level of carbon dioxide has increased. What is an explanation for this?

A. volcanoes erupting
B. humans use of fossil fuels
C. climate change
D. photosynthesis

User Timothyzhang
by
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2 Answers

3 votes

B. humans use of fossil fuels


User FlyingStreudel
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7.5k points
6 votes
B. HUMANS USE OF FOSSIL FUELS
User Richrd
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