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8. In what year was the concentration of carbon dioxide 355ppm? * о 2012 2010 о 1980 O 1990
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8. In what year was the concentration of carbon dioxide 355ppm? *

о 2012
2010
о 1980
O 1990

User HAK
by
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1 Answer

9 votes

Answer:

slightly after 1990 (when it was 354.19)

User Chiragjn
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