asked 160k views
23 votes
8. In what year was the concentration of carbon dioxide 355ppm? *

о 2012
2010
о 1980
O 1990

asked
User HAK
by
8.7k points

1 Answer

9 votes

Answer:

slightly after 1990 (when it was 354.19)

answered
User Chiragjn
by
8.1k points
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