What is the largest pool of carbon on the planet?
A - Atmospheric carbon dioxide
B - Sediments in the deep ocean
C - Carbon dioxide dissolved in the oceans
D - Fossil fuels
E - Biomass that makes up all living matter
Answer: B - Sediments in the deep ocean
The largest pool of carbon in the world is actually in the sediments of the deep ocean which are estimated to contain about 50 times the carbon that is currently in the atmosphere. It can stay out of circulation for millions of years, unless humans intervene.