Skip to main content
Using the numbers and arrows from Dr. Apps' chart (shown in the description), which of the following statements about the global carbon cycle is true?
The amount of carbon (dioxide) taken up by the oceans is less than the amount of carbon released by land use change.
Almost no carbon (dioxide) remains in the atmosphere after oceanic and plant uptake.
The amount of carbon (dioxide) released through burning fossil fuels is greater than any of the other well-known fluxes.
The amount of carbon (dioxide) released by land use change is greater than that released by burning fossil fuels.
Sources: Fossil fuel combustion/cement 6.3 +/- 0.8 gigatons Land use change 1.6 +/- 0.8 gigatons Sinks: Ocean uptake: 1.7 +/- 0.5 gigatons Land uptake: 2 to 4 gigatons