In Figure 12.5,prior to 1850,the global flux of carbon dioxide to the atmosphere due to fossil fuel emissions was close to zero.However,in the late 19th century,an increase can be observed.From 1900 to 2010,what has occurred with the global flux of carbon dioxide due to fossil fuel emissions?

A) It has increased from approximately 2 Pg of carbon per year to nearly 5 Pg of carbon per year
B) It has decreased from approximately 2 Pg of carbon per year to nearly -10 Pg of carbon per year
C) It has risen 10 fold
D) It has increased from approximately 2 Pg of carbon per year to nearly 10 Pg of carbon per year