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The Keeling curve shows that carbon dioxide concentration in Earth's atmosphere reached _____ ppm in 2013. a) 250 b) 300 c) 350 d) 400
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4 votes
The Keeling curve shows that carbon dioxide concentration in Earth's atmosphere

reached _____ ppm in 2013.
a) 250
b) 300
c) 350
d) 400

User Elfoc
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5 votes
The answer is c) 350 I’m pretty sure
User Aldan
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