According to the diagram, what is the estimated increase of carbon in the atmosphere (in gigatonnes) each year?
(A) 5.8
(B) 129.6
(C) 219.6
(D) 750.0
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統計: A(5), B(1), C(6), D(0), E(0) #2135957
統計: A(5), B(1), C(6), D(0), E(0) #2135957