Before the Industrial Revolution,the Concentration of CO₂ in Earth's Atmosphere

Multiple Choice

Before the Industrial Revolution,the concentration of CO₂ in Earth's atmosphere was 265 parts per million (ppm) .At the end of 2012,the concentration was 393 parts per million.Given the correlation of atmospheric CO₂ concentration with global temperature rise,what does this change suggest about the global carbon budget?

A) It is balanced;CO₂ concentration is not related to the global carbon budget.
B) It is balanced;rises in CO₂ concentrations measured in ppm will have no effect.
C) It is unbalanced;CO₂ is entering the atmosphere much faster than it can be removed.
D) It is unbalanced;CO₂ is being removed from the atmosphere much faster than it can enter.
E) It is unbalanced,but the imbalance is insignificant because the tiny CO₂ concentrations will have no effect.